WONDFO AMPHETAMINE URINE TEST (AMP 300), WONDFO METHAMPHETAMINE URINE TEST (MET 500)

• K Number: K122961
• Device Name: WONDFO AMPHETAMINE URINE TEST (AMP 300), WONDFO METHAMPHETAMINE URINE TEST (MET 500)
• Manufacturer: Guangzhou Wondfo Biotech Co., Ltd.
• Date Cleared: 2012-12-21 ( 87 days)
• Product Code: DKZ , LAF
• Regulation Number: 862.3100
• Type: Traditional
• Panel: Clinical Chemistry
• Reference & Predicate Devices: K041822 , K033299
• Predicate For: N/A

Intended Use

Wondfo Amphetamine Urine Test (AMP 300) and Wondfo Methamphetamine Urine Test (MET 500) are intended for the qualitative determination of d-Amphetamine and D(+)-Methamphetamine (target analyte) at the specific cut-off concentration in human urine. This product is only intended for prescription use and is not intended for point-of-care use. For in vitro diagnostic use only.

Wondfo Amphetamine Urine Test (AMP 300):
Wondfo Amphetamine Urine Test (AMP 300) is an immunochromatographic assay for the qualitative determination of d-Amphetamine in human urine at a cutoff concentration of 300 ng/mL. The test is available in a Dip Card format and a Cup format. This product is only intended for prescription use and is not intended for point-of-care use. For in vitro diagnostic use only.
The test provides only preliminary test results. A more specific alternative chemical method must be used in order to obtain a confirmed analytical result. GC/MS is the preferred confirmatory method. Clinical consideration and professional judgment should be exercised with any drug of abuse test result, particularly when the preliminary result is positive.

Wondfo Methamphetamine Urine Test (MET 500):
Wondfo Methamphetamine Urine Test (MET 500) is an immunochromatographic assay for the qualitative determination of D(+)-Methamphetamine in human urine at a cutoff concentration of 500 ng/mL. The test is available in a Dip Card format and a Cup format. This product is only intended for prescription use and is not intended for point-of-care use. For in vitro diagnostic use only.
The test provides only preliminary test results. A more specific alternative chemical method must be used in order to obtain a confirmed analytical result. GC/MS is the preferred confirmatory method. Clinical consideration and professional judgment should be exercised with any drug of abuse test result, particularly when the preliminary result is positive.

Device Description

Assay Principle: Immunochromatograph assay for Amphetamine and Methamphetamine Urine Test using a lateral flow, one step system for the qualitative detection of d-Amphetamine and D(+)-Methamphetamine (target analyte) in human urine. Each assay uses a monoclonal antibody-dye conjugate from mouse against drug with gold chloride and fixed drug-protein conjugate and anti-mouse IgG polyclonal antibody in membrane.

Wondfo Amphetamine Urine Test (AMP 300) and Wondfo Methamphetamine Urine Test (MET 500) are a one-step lateral flow immunoassay containing a conjugate pad with colloidal gold with anti-drug antibodies, a nitrocellulose membrane, with a test line (T) and a control line (C). The T line is coated with drug-protein conjugate and the C line is coated with goat anti-mouse IgG polyclonal antibodies. The test is a competitive binding immunoassay in which drugs in a urine sample compete with immobilized drug conjugate for limited labeled antibody binding sites. When a sufficient amount of sample is applied, the sample migrates through the test device by capillary action.

If the concentration of drug is below the cutoff level, the anti-drug antibodies in the colloidal gold particles will bind to the drug antigens coated in the test zone producing a band which indicates a negative result. If the drug concentration is at the cutoff level or higher no band will form in the test zone (test line T) indicating a preliminary positive. A band should form in the control region reqardless of the presence of drug or metabolite in the sample.

AI/ML Overview

1. Table of Acceptance Criteria and Reported Device Performance:

The document describes performance in terms of Precision and Comparison Studies (agreement with GC/MS). There aren't explicitly stated "acceptance criteria" in a numerical threshold format (e.g., "sensitivity must be >95%"). However, the precision study demonstrates performance at various percentages of the cutoff, which implies an expectation for accurate detection around these critical thresholds. The comparison study directly compares the device's qualitative results to a gold standard (GC/MS).

Here's a table summarizing the reported device performance, with implied acceptance from the provided data:

Wondfo Amphetamine Urine Test (AMP 300) - Cup Format

Performance Characteristic	Reported Device Performance (Example for 3 lots)	Implied Acceptance Criteria (based on data presentation)
Precision
-100% cutoff	50-/0+ (All negative)	Consistent negative results well below cutoff
-75% cutoff	50-/0+ (All negative)	Consistent negative results below cutoff
-50% cutoff	50-/0+ (All negative)	Consistent negative results below cutoff
-25% Cut off	50-/0+ (All negative)	Consistent negative results approaching cutoff
+25% cut off	47+/3-, 45+/5- (Mix of positive/negative)	Majority positive, tolerating some false negatives
+50% cut off	50+/0- (All positive)	Consistent positive results well above cutoff
+75% cut off	50+/0- (All positive)	Consistent positive results well above cutoff
+100% cut off	50+/0- (All positive)	Consistent positive results well above cutoff
Comparison Study (vs GC/MS)
Drug-free (Negatives)	All viewers: 10 Negative, 0 Positive	100% agreement with GC/MS for drug-free samples
Low Negative (< -50%)	All viewers: 17 Negative, 0 Positive	100% agreement with GC/MS for low negative samples
Near Cutoff Negative (-50% to Cutoff)	Viewer A: 11 Negative, 2 Positive (example)	High agreement; some discordance around cutoff expected
Near Cutoff Positive (Cutoff to +50%)	All viewers: 0 Negative, 29 Positive	High agreement; some discordance around cutoff expected
High Positive (> +50%)	All viewers: 0 Negative, 11 Positive	100% agreement with GC/MS for high positive samples

Wondfo Methamphetamine Urine Test (MET 500) - Cup Format

Performance Characteristic	Reported Device Performance (Example for 3 lots)	Implied Acceptance Criteria (based on data presentation)
Precision
-100% cutoff	50-/0+ (All negative)	Consistent negative results well below cutoff
-75% cutoff	50-/0+ (All negative)	Consistent negative results below cutoff
-50% cutoff	50-/0+ (All negative)	Consistent negative results below cutoff
-25% Cut off	50-/0+ (All negative)	Consistent negative results approaching cutoff
+25% cut off	45+/5-, 46+/4- (Mix of positive/negative)	Majority positive, tolerating some false negatives
+50% cut off	50+/0- (All positive)	Consistent positive results well above cutoff
+75% cut off	50+/0- (All positive)	Consistent positive results well above cutoff
+100% cut off	50+/0- (All positive)	Consistent positive results well above cutoff
Comparison Study (vs GC/MS)
Drug-free (Negatives)	All viewers: 10 Negative, 0 Positive	100% agreement with GC/MS for drug-free samples
Low Negative (< -50%)	All viewers: 15 Negative, 0 Positive	100% agreement with GC/MS for low negative samples
Near Cutoff Negative (-50% to Cutoff)	Viewer A: 13 Negative, 2 Positive (example)	High agreement; some discordance around cutoff expected
Near Cutoff Positive (Cutoff to +50%)	All viewers: 0 Negative, 20 Positive	High agreement; some discordance around cutoff expected
High Positive (> +50%)	All viewers: 0 Negative, 20 Positive	100% agreement with GC/MS for high positive samples

(Note: Dip Card format shows very similar performance to Cup Format in the provided data)

2. Sample Size and Data Provenance for Test Set:

• Sample Size:
  • Precision Studies: For each drug (AMP 300 and MET 500) and format (Cup, Dip Card), and for each of 3 lots, 50 tests were performed at each of 8 concentrations (a total of 400 tests per lot per drug/format, or 1200 tests per drug/format across 3 lots).
  • Comparison Studies (with GC/MS): For each drug (AMP 300 and MET 500) and format (Cup, Dip Card), 80 unaltered clinical urine samples were used (40 negative and 40 positive based on GC/MS). Each sample was tested by 3 laboratory assistants. So, 80 samples * 3 viewers = 240 results per drug/format for the comparison.
• Data Provenance: "Unaltered clinical samples" imply the data is from real patient samples. The document does not specify the country of origin but was submitted by a company in Guangzhou, P.R. China, with a contact in Gaithersburg, MD, USA. The study was performed "in-house." The nature of the study (using clinical samples, compared to a gold standard) suggests it is retrospective, as the GC/MS results would have been established prior to or concurrently with the device testing for comparison.

3. Number of Experts and Qualifications for Ground Truth (Test Set):

• Number of Experts: For the comparison studies, the "Wondfo Result" (the classification by the device) was read by 3 laboratory assistants. Their qualifications are stated as having "relevant experience reading the instructions for use."
• Ground Truth Qualification: The primary ground truth for the comparison study was established by GC/MS (Gas Chromatography/Mass Spectrometry). This is explicitly stated as "GC/MS results" and "GC/MS is the preferred confirmatory method." GC/MS is a highly accurate and accepted gold standard for drug detection and quantification in urine.

4. Adjudication Method for the Test Set:

• The document implies no adjudication was performed among the "3 laboratory assistants" for the comparison study. Each viewer's results are presented separately. The "Viewer Result" column reflects individual interpretations. The final comparison is made against the GC/MS result for each sample, indicating a direct comparison rather than an adjudicated consensus among the viewers of the Wondfo device.

5. Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study:

• No, a typical MRMC comparative effectiveness study was not done in the sense of comparing human readers with AI assistance versus without AI assistance to measure improvement. This document describes the performance of a standalone diagnostic device (an immunoassay), not an AI algorithm assisting human readers.
• The "Wondfo Result" is the interpretation of the immunoassay itself, not an AI output. The "human readers" in this context (the 3 laboratory assistants) are simply interpreting the visual result of the Wondfo test, and their individual performance (agreement with GC/MS) is shown.

6. Standalone Performance Study:

• Yes, a standalone performance study was done. The entire "Performance Characteristics" section details the standalone performance of the Wondfo Amphetamine Urine Test and Wondfo Methamphetamine Urine Test.
  • Precision studies evaluate the device's consistency and reliability at different concentrations.
  • Comparison studies directly compare the device's qualitative results to the GC/MS ground truth without human intervention in the interpretation of the GC/MS or the Wondfo result (other than the laboratory assistants visually reading the test line). The results presented are essentially the device's output compared to the reference. This is a standalone evaluation of the device's diagnostic accuracy.

7. Type of Ground Truth Used:

• GC/MS (Gas Chromatography/Mass Spectrometry) was used as the ground truth for the comparison studies. This is a highly specific and sensitive analytical method considered the gold standard for confirming drug presence and concentration in biological samples.

8. Sample Size for the Training Set:

• This document describes the performance of an immunoassay device, which is based on pre-set chemical reactions and antibodies, not a machine learning model that requires a "training set" in the computational sense. Therefore, the concept of a training set sample size is not applicable to this device. The device itself is "trained" by its manufacturing process to react to specific analytes at given concentrations.

9. How Ground Truth for the Training Set Was Established:

• As stated above, this is not applicable because the device is a chemical immunoassay, not an AI/machine learning algorithm requiring a computational training set with associated ground truth. The "ground truth" during the development and manufacturing of such a device would relate to the chemical properties of the analytes (d-Amphetamine and D(+)-Methamphetamine) and the specificity and sensitivity of the antibodies and reagents used.

Summary

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K122961

TABLE 4

SUMMARY

DEC 2 1 2012

1. Date:

2. Submitter:

November 1, 2012

Guangzhou Wondfo Biotech Co., Ltd. South China University of Technology Guangzhou, P.R. China 510641 012-86-20-32296069

3. Name of contact person: Joe Shia LSI International Inc.

504 East Diamond Ave .. Suite F Gaithersburg, MD 20878 Telephone: [phone] Fax: [phone] Email:[e-mail]

4. Device Name:

Wondfo Amphetamine Urine Test (AMP 300) Wondfo Methamphetamine Urine Test (MET 500)

Classification: All are Class II medical devices with the following various product codes with Code of Federal Requlation references:

Product Code	CFR #
DKZ	21 CFR, 862.3100
LAF	21 CFR, 862.3610

5. Predicate Devices:

• 1. K041822
• Acon Laboratories, Inc.

ACON® AMP 300 One Step Amphetamine Test Strip, ACON® AMP 300 One Step Amphetarmine Test Device

2. K033299

Acon Laboratories, Inc.

ACON® mAMP-500 One Step Methamphetamine Test Strip, ACON® mAMP-500 One Step Methamphetamine Test Device

6. Intended Use:

Wondfo Amphetamine Urine Test (AMP 300) and Wondfo Methamphetamine Urine Test (MET 500) are intended for the qualitative determination of d-Amphetamine and D(+)-Methamphetamine (target analyte) at the specific cut-off concentration in human urine. This product is only intended for prescription use and is not intended for point-of-care use. For in vitro diagnostic use only.

7. Device Description:

Assay Principle: Immunochromatograph assay for Amphetamine and Methamphetamine Urine Test using a lateral flow, one step system for the qualitative detection of d-Amphetamine and D(+)-Methamphetamine (target analyte) in human urine. Each assay uses a monoclonal antibody-dye conjugate from mouse against drug with gold chloride and fixed drug-protein conjugate and anti-mouse IgG polyclonal antibody in membrane.

8. Substantial Equivalence Information

A summary comparison of the features of the Wondfo Amphetamine Urine Test (AMP 300) and Wondfo Methamphetamine Urine Test (MET 500) and the predicate devices is provided in the Table 2.

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Table 1: Features Comparison of Wondfo Amphetamine Urine Test (AMP 300) and the Predicate Devices

Item	Device	Predicate - K041822
Indication(s) for Use	For the qualitative determination of Amphetamine in human urine.	Same
Calibrator	d-Amphetamine	Same
Methodology	Competitive binding, lateral flow immunochromatographic assays based on the principle of antigen antibody immunochemistry.	Same
Type of Test	Immunoassay principles that rely on antigen-antibody interactions to indicate positive or negative result	Same
Specimen Type	Human Urine	Same
Cut Off Values	300 ng/mL	Same
Configurations	Cup, Dip Card	Strip, Device
Intended Use	Prescription Use and not for point-of-care use	Prescription Use and for point-of-care use

Table 2: Features Comparison of Wondfo Methamphetamine Urine Test (MET 500) and the Predicate Devices

Item	Device	Predicate - K033299
Indication(s) for Use	For the qualitative determination of D(+)-Methamphetamine in human urine.	Same
Calibrator	D(+)-Methamphetamine	Same
Methodology	Competitive binding, lateral flowimmunochromatographic assays based on theprinciple of antigen antibody immunochemistry.	Same
Type of Test	Immunoassay principles that rely on antigen-antibody interactions to indicate positive ornegative result	Same
Specimen Type	Human Urine	Same
Cut Off Values	500 ng/mL	Same
Configurations	Cup, Dip Card	Strip, Device
Intended Use	Prescription Use and not for point-of-care use	Prescription Use and forpoint-of-care use

9. Standard/Guidance Document Reference

• Baselt, R.C. Disposition of Toxic Drugs and Chemicals in Man. Biomedical Publications, Davis, CA, . 1982.
• Ellenhorn, M.J. and Barceloux, D. G Medical Toxicology. Elservier Science Publishing Company, Inc., . New York, 1988
• Gilman, A. G., and Goodman, L. S. The Pharmacological Fluids, in Martin WR(ed): Drug Addiction I, . New York, Spring - Verlag, 1977.
• Harvey, R.A., Champe, P.C. Lippincotts Illustrated Reviews. Pharmacology. 91-95, 1992. .
• Hawwks RL, CN Chiang, Urine Testing for drugs of Abuse. National Institute for Drug Abuse (NIDA), . Research Monography 73, 1986

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• . Hofmann F.E., A Handbook on Drug and Alcohol Abuse: The Biomedical Aspects, New York, Oxford University Press, 1983.
• McBay, A. J. Clin. Chem. 33,33B-40B, 1987 .

10. Test Principle

Wondfo Amphetamine Urine Test (AMP 300) and Wondfo Methamphetamine Urine Test (MET 500) are a one-step lateral flow immunoassay containing a conjugate pad with colloidal gold with anti-drug antibodies, a nitrocellulose membrane, with a test line (T) and a control line (C). The T line is coated with drug-protein conjugate and the C line is coated with goat anti-mouse IgG polyclonal antibodies. The test is a competitive binding immunoassay in which drugs in a urine sample compete with immobilized drug conjugate for limited labeled antibody binding sites. When a sufficient amount of sample is applied, the sample migrates through the test device by capillary action.

If the concentration of drug is below the cutoff level, the anti-drug antibodies in the colloidal gold particles will bind to the drug antigens coated in the test zone producing a band which indicates a negative result. If the drug concentration is at the cutoff level or higher no band will form in the test zone (test line T) indicating a preliminary positive. A band should form in the control region reqardless of the presence of drug or metabolite in the sample.

11. Performance Characteristics

11.1. Analytical Performance

• a. Precision
  Precision studies were carried out for samples with concentrations of -100%cut off, -50%cut off, -25%cut off, +25%cut off, +50%cut off , +75%cut off and +100%cut off. For each concentration, tests were performed two runs per day for 25 days. The results obtained are summarized in the following table.

Cup Format

AMP 300:
Result	-100%cut off	-75%cut off	-50%cut off	-25%Cut off	+25%cut off	+50%cut off	+75%cut off	+100%cut off
AMP 300
LOT W0770901CU2	50-/0+	50-/0+	50-/0+	50-/0+	47+/3-	50+/0-	50+/0-	50+/0-	50+/0-
LOT W0770902CU2	50-/0+	50-/0+	50-/0+	50-/0+	45+/5-	50+/0-	50+/0-	50+/0-	50+/0-
LOT W0770903CU2	50-/0+	50-/0+	50-/0+	50-/0+	45+/5-	50+/0-	50+/0-	50+/0-	50+/0-

ARD 200

				MET 500:
Result	-100%cut off	-75%cut off	-50%cut off	-25%Cut off	+25%cut off	+50%cut off	+75%cut off	+100%cut off
MET 500
LOT W1170901CU2	50-/0+	50-/0+	50-/0+	50-/0+	45+/5-	50+/0-	50+/0-	50+/0-	50+/0-
LOT W1170902CU2	50-/0+	50-/0+	50-/0+	50-/0+	46+/4-	50+/0-	50+/0-	50+/0-	50+/0-
LOT W1170903CU2	50-/0+	50-/0+	50-/0+	50-/0+	46+/4-	50+/0-	50+/0-	50+/0-	50+/0-

Dip Card Format

AMP 300:
Result	-100% cut off	-75% cut off	-50% cut off	-25% cut off	cut off	+25% cut off	+50% cut off	+75% cut off	+100% cut off
AMP 300
LOT W0770901P	50-/0+	50-/0+	50-/0+	50-/0+	44+/6-	50+/0-	50+/0-	50+/0-	50+/0-
LOT W0770902P	50-/0+	50-/0+	50-/0+	50-/0+	45+/5-	50+/0-	50+/0-	50+/0-	50+/0-
LOT W0770903P	50-/0+	50-/0+	50-/0+	50-/0+	46+/4-	50+/0-	50+/0-	50+/0-	50+/0-

MET 500:

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Result	-100%cut off	-75%cut off	-50%cut off	-25%cut off	+25%cut off	+50%cut off	+75%cut off	+100%cut off
MET 500
LOT W1170901P	50-/0+	50-/0+	50-/0+	50-/0+	46+/4-	50+/0-	50+/0-	50+/0-
LOT W1170902P	50-/0+	50-/0+	50-/0+	50-/0+	44+/6-	50+/0-	50+/0-	50+/0-
LOT W1170903P	50-/0+	50-/0+	50-/0+	50-/0+	45+/5-	50+/0-	50+/0-	50+/0-

b. Linearity

Not applicable

c. Stability

Stable for 18 months when stored at 4 to 30 ℃

d. Cut-off

Test	Calibrator	Cut-off (ng/mL)
Wondfo Amphetamine Urine Test (AMP 300)	d-Amphetamine	300
Wondfo Methamphetamine Urine Test (MET 500)	D(+)-Methamphetamine	500

' .

e. Interference

Compounds that show no interference at a concentration of 100 µg/mL are summarized in the following tables.

AMP 300
4-Acetamidophenol	(-) Y Ephedrine	Penicillin-G
Acetophenetidin	Erythromycin	Pentazocaine
N-Acetylprocainamide	B-Estradiol	Pentobarbital
Acetylsalicylic acid	Estrone-3-sulfate	Perphenazine
Aminopyrine	Ethyl-p-aminobenzoate	Phencyclidine
Amitryptyline	Fenfluramine	Phenelzine
Amobarbital	Fenoprofen	Phendimetrazine
Amoxicillin	Furosemide	Phenobarbital
Ampicillin	Gentisic acid	Phetoin
Ascorbic acid	Hemoglobin	L-Phenylephrine
Apomorphine	Hydralazine	ẞ-Phenylethlamine
Aspartame	Hydrochlorothiazide	Phenylpropanolamine
Atropine	Hydrocodone	Prednisolone
Benzilic acid	Hydrocortisone	Prednisone
Benzoic acid	O-Hydroxyhippuric acid	Procaine
Benzoylecgonine	3-Hydroxytyramine	Promazine
Bilirubin	Ibuprofen	Promethazine
Brompheniramine	Imipramine	D,L-Propanolol
Caffeine	(-) Isoproterenol	Propiomazine
Cannabidiol	Isoxsuprine	D-Propoxyphene
Cannabinol	Ketamine	Quinidine
Chloralhydrate	Ketoprofen	Quinine
Chloramphenicol	Labetalol	Ranitidine
Chlordiazepoxide	Levorphanol	Salicylic acid
Chlorothiazide	Loperamide	Secobarbital
(±) Chlorpheniramine	Maprotiline	Serotonin
Chlorpromazine	Meperidine	Sulfamethazine
Chlorquine	Meprobamate	Sulindac
Cholesterol	Methadone	Temazepam
Clomipramine	Methylphenidate	Tetracycline
Clonidine	Morphine-3-Dglucuronide	Tetrahydrocortisone
Cocaine hydrochloride	Nalidixic acid	Tetrahydrozoline
Codeine	Naloxone	Δ9-THC-COOH
Cortisone	Naltrexone	Thebaine
(-) Cotinine	Naproxen	Thiamine
Creatinine	Niacinamide	Thioridazine
Deoxycorticosterone	Nifedipine	D,L-Thyroxine

·

AMP 300

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Dextromethorphan	Norcodeine	Tolbutamine
Diazepam	Norethindrone	Triamterene
Diclofenac	D-Norpropoxyphene	Trifluoperazine
Diflunisal	Noscapine	Trimethoprim
Digoxin	D,L-Octopamine	Trimipramine
Diphenhydramine	Oxalic acid	Tryptamine
Doxylamine	Oxazepam	D, L-Tyrosine
Ecgonine hydrochloride	Oxolinic acid	Uric acid
Ecgonine methylester	Oxycodone	Verapamil
(IR,2S)-(-)-Ephedrine	Oxymetazoline	Zomepirac
L-Ephedrine	Papaverine

MET 500

.

Acetamidophen	Gentisic acid	Oxycodone
Acetophenetidin	Glucuronide	Oxymetazoline
N-Acetylprocainamide	Glutethimide	Papaverine
Acetylsalicylate	Guaifenesin	Penicillin-G
Aminopyrine	Hippuric acid	Pentazocine
Amitryptyline	Hydralazine	Pentobarbital
Amobarbital	Hydrochlorothiazide	Perphenazine
Amoxicillin	Hydrocodone	Phencyclidine
Ampicillin	Hydrocortisone	Phenelzine
Apomorphine	O-Hydroxyhippuric acid	Phenobarbital
Aspartame	3-Hydroxytyramine	Prednisolone
Atropine	Ibuprofen	Phenylpropanolamine
Benzilic acid	Imipramine	Prednisone
Benzoic acid	(-) Isoproterenol	Procaine
Benzoylecgonine	Isoxsuprine	Promazine
Butabartital	Ketamine	Promethazine
Cannabidiol	Ketoprofen	D,L-Propanolol
Chloralhydrate	Labetalol	D-Propoxyphene
Chloramphenicol	Levorphanol	D-Pseudoephedrine
Chlordiazepoxide	Loperamide	Quinidine
Chlorothiazide	Loxapine succinate	Quinine
Chlorpromazine	Maprotiline	Ranitidine
Cholesterol	Meperidine	Salicylic acid
Clomipramine	Meprobamate	Secobarbital
Clonidine	Methadone	Serotonin (5- Hydroxytyramine)
Cocaine hydrochloride	Methaqualone	Sulfamethazine
Codeine	Methylphenidal	Sulindac
Cortisone	Methyprylon	Temazepam
(-) Cotinine	Morphine-3- β -Dglucuronide	Tetracycline
Creatinine	Nalidixic acid	Tetrahydrocortisone, 3-Acetate
Deoxycorticosterone	Nalorphine	Tetrahydrocortisone 3 ( β -D glucuronide)
Dextromethorphan	Naloxone	Tetrahydrozoline
Diazepam	Naltrexone	Thebaine
Diclofenac	Naproxen	Thiamine
Diflunisal	Niacinamide	Thioridazine
Digoxin	Nifedipine	Tolbutamine
Diphenhydramine	Norcodein	Triamterene
Doxylamine	Norethindrone	Trifluoperazine
Ecgonine hydrochloride	Noroxymorphone	Trimethoprim
Ecgonine methyl ester	D-Norpropoxyphene	Trimipramine
Erythromycin	Noscapine	D, L-Tryptophan
β-Estradiol	Nylidrin	Tyramine
Estrone-3-sulfate	D, L-Octopamine	D, L-Tyrosine
Ethyl-p-aminobenzoate	Oxalic acid	Uric acid
Fenoprofen	Oxazepam	Verapamil

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f. Specificity

To test the specificity, target drug, drug metabolites and other components that are likely to be present in urine samples were tested. Compounds that produced positive results with the test when tested at levels equal to or greater than the concentrations listed below. Percent cross reactivity of a compound is calculated by dividing the cutoff concentration by the minimum concentration required to obtain a positive result and the multiplying by 100%.

AMP 300
AMP(Amphetamine)(d-Amphetamine, Cutoff=300 ng/mL)	Minimum concentrationrequired to obtain a positiveresult (ng/mL)	% Cross-Reactivity
d-Amphetamine	300	100%
I-Amphetamine	17500	1.7%
dl-Amphetamine	850	35.3%
(+/-) 3,4-methylenedioxyamphetamine (MDA)	1000	30.0%
Phentermine	1000	30.0%
β -Phenylethylamine	100000	0.3%
Tyramine	100000	0.3%
p-Hydroxynorephedrine	100000	0.3%
Phenylpropanolamine	>100,000	Not detected
(±)Phenylpropanolamine	>100,000	Not detected
p-Hydroxyamphetamine	100,000	0.3%
d/I-Norephedrine	100,000	0.3%
d-Methamphetamine	>100,000	Not detected
I-Methamphetamine	>100,000	Not detected
(+/-)3,4-Methylenedioxyethylamphetamine(MDE)	>100,000	Not detected
(+/-)3,4-Methylenedioxymethamphetamine(MDMA)	>100,000	Not detected
Benzphetamine	>100,000	Not detected
Ephedrine	>100,000	Not detected
I-Ephedrine	>100,000	Not detected
I-Epinephrine	>100,000	Not detected
d/I-Epinephrine	>100,000	Not detected

MET 500
MET(Methamphetamine)(D(+)-Methamphetamine, Cutoff=500 ng/mL)	Minimum concentrationrequired to obtain a positiveresult (ng/mL)	% Cross-Reactivity
D(+)-Methamphetamine	500	100%
D-Amphetamine	50000	1.0%
Chloroquine	10000	5.0%
(+/-)-Ephedrine	25000	2.0%
(-)-Methamphetamine	10000	5.0%
(+/-)3,4-methylenedioxumethamphetamine(MDMA)	1000	50.0%
β-Phenylethylamine	25000	2.0%
Trimethobenzamide	5000	10.0%
d/l-Amphetamine	75,000	0.7%
p-Hydroxymethamphetamine	15,000	3.3%
Mephentermine	25,000	2.0%

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-PhenvlephrineBALLER I BE BERE BEAULT------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------	100 000	V.VI

11.2. Comparison Studies

The method comparison for the Wondfo Amphetamine Urine Test (AMP 300), Wondfo Methamphetamine Urine Test (MET 500) were performed in-house with three laboratory assistants with relevant experience reading the instructions for use. Operators ran 80 (40 negative and 40 positive) unaltered clinical samples were blind labeled and compared to GC/MS results. The results are presented in the table below:

AMP 300:

Cup Format

	Wondfo Result	Drug-free	Low Negative byGC/MS(Less than -50%)	Near CutoffNegative byGC/MS(Between -50%and Cutoff)	Near CutoffPositive byGC/MS(Between theCutoff and +50%)	High Positive byGC/MS (Greaterthan +50%)
Viewer A	Positive	0	0	2	29	11
	Negative	10	17	11	0	0
Viewer B	Positive	0	0	1	29	11
	Negative	10	17	12	0	0
Viewer C	Positive	0	0	1	29	11
	Negative	10	17	12	0	0

Dip Card Format

	Wondfo Result	Drug-free	Low Negative byGC/MS(Less than -50%)	Near CutoffNegative byGC/MS(Between -50%and Cutoff)	Near CutoffPositive byGC/MS(Between theCutoff and +50%)	High Positive byGC/MS (Greaterthan +50%)
Viewer A	Positive	0	0	1	29	11
	Negative	10	17	12	0	0
Viewer B	Positive	0	0	1	29	11
	Negative	10	17	12	0	0
Viewer C	Positive	0	0	1	29	11
	Negative	10	17	12	0	0

Discordant Results of AMP 300

Viewer	Sample Number	GC/MS Result	Cup Format Viewer Result
Viewer A	AMP3063	281	Positive
Viewer A	AMP3216	259	Positive
Viewer B	AMP3218	287	Positive
Viewer C	AMP3063	281	Positive

Viewer	Sample Number	GC/MS Result	Dip Card Format Viewer Results
Viewer A	AMP3218	287	Positive
Viewer B	AMP3216	259	Positive
Viewer C	AMP3063	281	Positive

MET 500:

Cup Format

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	Wondfo Result	Drug-free	Low Negative byGC/MS(Less than -50%)	Near CutoffNegative byGC/MS(Between -50%and Cutoff)	Near CutoffPositive byGC/MS(Between theCutoff and +50%)	High Positive byGC/MS (Greaterthan +50%)
Viewer A	Positive	0	0	2	20	20
	Negative	10	15	13	0	0
Viewer B	Positive	0	0	2	20	20
	Negative	10	15	13	0	0
Viewer C	Positive	0	0	2	20	20
	Negative	10	15	13	0	0

Dip Card Format

Wondfo Result	Drug-free	Low Negative byGC/MS(Less than -50%)	Near CutoffNegative byGC/MS(Between -50%and Cutoff)	Near CutoffPositive byGC/MS(Between theCutoff and +50%)	High Positive byGC/MS (Greaterthan +50%)
Viewer A	Positive	0	0	1	20	20
	Negative	10	15	14	0	0
Viewer B	Positive	0	0	1	20	20
	Negative	10	15	14	0	0
Viewer C	Positive	0	0	2	20	20
	Negative	10	15	13	0	0

Discordant Results of MET 500

Viewer	Sample Number	GC/MS Result	Cup Format ViewerResult
Viewer A	MET5061	478	Positive
Viewer A	MET5216	474	Positive
Viewer B	MET5063	499	Positive
Viewer B	MET5215	421	Positive
Viewer C	MET5061	478	Positive
Viewer C	MET5063	499	Positive
Viewer	Sample Number	GC/MS Result	Dip Card FormatViewer Results
Viewer A	MET5063	499	Positive
Viewer B	MET5061	478	Positive
Viewer C	MET5061	478	Positive
Viewer C	MET5063	499	Positive

11.3. Clinical Studies

Not applicable

12. Conclusion

Based on the test principle and performance characteristics of the device, it's concluded that Wondfo Amphetamine Urine Test (AMP 300), Wondfo Methamphetamine Urine Test (MET 500) are substantially equivalent to the predicate devices.

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Image /page/8/Picture/0 description: The image shows the logo for the U.S. Department of Health and Human Services. The logo consists of a stylized caduceus symbol, which is a staff with two snakes entwined around it, and the words "DEPARTMENT OF HEALTH & HUMAN SERVICES • USA" arranged in a circular pattern around the symbol. The logo is black and white.

DEPARTMENT OF HEALTH & HUM AN SERVICES

Public Health Service

Food and Drug Administraion 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-002

December 21, 2012

Guangzhou Wondfo Biotech Co., Ltd. LSI International Inc. c/o Joe Shia 504 East Diamond Ave. Suite F Gaithersburg, MD 20878

Re: K122961

Trade/Device Name: Wondfo Amphetamine Urine Test (AMP 300) Wondfo Methamphetamine Urine Test (MET 500)

Regulation Number: 21 CFR 862.3100 Regulation Name: Amphetamine Test System Regulatory Class: Class II Product Code: DKZ, LAF Dated: November 8, 2012 Received: November 13, 2012

Dear Mr Shia:

We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.

If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.

Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting (reporting of medical

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Page 2 - Mr. Joe Shia

device-related adverse events) (21 CFR 803); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.

If you desire specific advice for your device on our labeling regulation (21 CFR Parts 801 and 809), please contact the Office of In Vitro Diagnostics and Radiological Health at [phone]. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to

http://www.fda.gov/MedicalDevices/Safety/ReportalProblem/default.htm for the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance.

You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number [phone] or [phone] or at its Internet address http://www.fda.gov/cdrh/industry/support/index.html.

Sincerely yours,

Carol C. Benson for

Courtney H. Lias, Ph.D. Director Division of Chemistry and Toxicology Devices In Vitro Diagnosticsand Radiological Health Center for Devices and Radiological Health

Enclosure

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Indications for Use

510(k) Number (if known): K122961

Wondfo Amphetamine Urine Test (AMP 300) Device Name: Wondfo Methamphetamine Urine Test (MET 500)

Indications for Use:

Wondfo Amphetamine Urine Test (AMP 300):

Wondfo Amphetamine Urine Test (AMP 300) is an immunochromatographic assay for the qualitative determination of d-Amphetamine in human urine at a cutoff concentration of 300 ng/mL. The test is available in a Dip Card format and a Cup format. This product is only intended for prescription use and is not intended for point-of-care use. For in vitro diagnostic use only.

The test provides only preliminary test results. A more specific alternative chemical method must be used in order to obtain a confirmed analytical result. GC/MS is the preferred confirmatory method. Clinical consideration and professional judgment should be exercised with any drug of abuse test result, particularly when the preliminary result is positive.

Wondfo Methamphetamine Urine Test (MET 500):

Wondfo Methamphetamine Urine Test (MET 500) is an immunochromatographic assay for the qualitative determination of D(+)-Methamphetamine in human urine at a cutoff concentration of 500 ng/mL. The test is available in a Dip Card format and a Cup format. This product is only intended for prescription use and is not intended for point-of-care use. For in vitro diagnostic use only.

(PLEASE DO NOT WRITE BELOW THIS LINE; CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of CDRH, Office of In Vitro Diagnostics and Radiological Health (OIR)

enise Johnson-Lyles
Division Sign Off

Office of In Vitro Diagnostics and Radiological Health 510(k) 1961

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The test provides only preliminary test results. A more specific alternative chemical method must be used in order to obtain a confirmed analytical result. GC/MS is the preferred confirmatory method. Clinical consideration and professional judgment should be exercised with any drug of abuse test result, particularly when the preliminary result is positive.

Prescription Use X (21 CFR Part 801 Subpart D) And/Or

Over the Counter Use (21 CFR Part 801 Subpart C)

(PLEASE DO NOT WRITE BELOW THIS LINE; CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of CDRH, Office of In Vitro Diagnostics and Radiological Health (OIR)

Denise Johnsonlephs
Division Sign-Off

Office of In Vitro Diagnostics and Radiological Health 510(k) K177961

Regulation Number and Section

§ 862.3100 Amphetamine test system.

(a)
Identification. An amphetamine test system is a device intended to measure amphetamine, a central nervous system stimulating drug, in plasma and urine. Measurements obtained by this device are used in the diagnosis and treatment of amphetamine use or overdose and in monitoring levels of amphetamine to ensure appropriate therapy.(b)
Classification. Class II (special controls). An amphetamine test system is not exempt if it is intended for any use other than employment or insurance testing or is intended for Federal drug testing programs. The device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 862.9, provided the test system is intended for employment and insurance testing and includes a statement in the labeling that the device is intended solely for use in employment and insurance testing, and does not include devices intended for Federal drug testing programs (e.g., programs run by the Substance Abuse and Mental Health Services Administration (SAMHSA), the Department of Transportation (DOT), and the U.S. military).