(29 days)
SAFECARE® THC Urine Strip Test is a competitive binding, lateral flow immunochromatographic assay for qualitative detection of Marijuana in human urine at the cutoff concentrations of 50 ng/mL.
The test provides only preliminary test results. A more specific alternative chemical must be used in order to obtain a confirmed analytical result. GC/MS or LC/MS is the preferred confirmatory method.
The test is intended for over-the-counter use.
SAFECARE® THC Urine Strip Test devices are immunochromatographic assays for the qualitative detection of 11-nor-A9-THC-9 COOH (target analyte) in human urine. The product is a single-use in vitro diagnostic device. It contains a Test Device and a package insert. Each test device is sealed with a desiccant in an aluminum pouch.
The provided document outlines the acceptance criteria and performance data for the SAFECARE® THC Urine Strip Test, which is a qualitative lateral flow immunoassay for detecting Marijuana in human urine.
Here's the breakdown of the requested information:
1. Table of Acceptance Criteria and Reported Device Performance
The document does not explicitly state formal "acceptance criteria" for precision or accuracy using specific numerical thresholds (e.g., >95% agreement). Instead, it presents the results of various performance studies. The overall acceptance is inferred from the device being deemed "substantially equivalent" to a predicate device.
However, based on the performance characteristics, we can infer performance goals for accuracy at different concentrations relative to the cutoff.
| Acceptance Criteria Category | Specific Metric (Inferred) | Acceptance Threshold (Inferred/Observed) | Reported Device Performance | Comments on Performance |
|---|---|---|---|---|
| Analytical Performance | ||||
| Precision | Agreement at various | High agreement expected, especially | ||
| concentrations | at concentrations further from cutoff. | |||
| -100% Cut-off | 100% Negative (0% Positive) | Lot 1, 2, 3: 50-/0+ | Meets expectation | |
| -75% Cut-off | 100% Negative (0% Positive) | Lot 1, 2, 3: 50-/0+ | Meets expectation | |
| -50% Cut-off | 100% Negative (0% Positive) | Lot 1, 2, 3: 50-/0+ | Meets expectation | |
| -25% Cut-off | 100% Negative (0% Positive) | Lot 1, 2, 3: 50-/0+ | Meets expectation | |
| Cut-off (50 ng/mL) | ~50% Positive, ~50% Negative | Lot 1, 2: 25-/25+; Lot 3: | Meets expectation | |
| 26-/24+ | ||||
| +25% Cut-off | 100% Positive (0% Negative) | Lot 1, 2, 3: 50+/0- | Meets expectation | |
| +50% Cut-off | 100% Positive (0% Negative) | Lot 1, 2, 3: 50+/0- | Meets expectation | |
| +75% Cut-off | 100% Positive (0% Negative) | Lot 1, 2, 3: 50+/0- | Meets expectation | |
| +100% Cut-off | 100% Positive (0% Negative) | Lot 1, 2, 3: 50+/0- | Meets expectation | |
| Interference | No interference from | No false positives or negatives due to | Compounds at 100µg/mL | No interference reported |
| common substances | specified interfering substances when | (list provided) showed no | ||
| drug is absent or present above cutoff | interference. | |||
| Specificity | Cross-reactivity with | Low or no cross-reactivity with | Provided specific cross- | Demonstrated specificity |
| related compounds | non-target compounds. | reactivity percentages for | ||
| related cannabinoids. | ||||
| Urine Specific Gravity | Correct results across | Correct classification (negative for | Samples from 1.000 to 1.035 | Device performs reliably |
| range of SG | -25% cutoff, positive for +25% cutoff). | with THC at +/-25% cutoff | across range of urine SG | |
| showed expected results. | ||||
| Urine pH | Correct results across | Correct classification (negative for | Samples from pH 4 to 9 with | Device performs reliably |
| range of pH | -25% cutoff, positive for +25% cutoff). | THC at +/-25% cutoff | across range of urine pH | |
| showed expected results. | ||||
| Comparison Studies | Agreement with LC/MS | High agreement between device results | ||
| for clinical samples | and LC/MS, particularly for samples | |||
| not near the cutoff. | ||||
| Overall Agreement | Not explicitly quantified, but inferred | Viewer A: 78/80 (97.5%) | High agreement for | |
| from discordant results. | Viewer B: 78/80 (97.5%) | human readers | ||
| Viewer C: 79/80 (98.75%) | ||||
| Lay-User Study | Ease of use | Instructions are easily understood. | All lay users indicated | Instructions are clear |
| instructions were easy to | ||||
| Accuracy of self-testing | High percentage of correct results, | |||
| decreasing near the cutoff. | ||||
| -100% Cutoff | 100% agreement | 100% Correct | Excellent | |
| -75% Cutoff | 100% agreement | 100% Correct | Excellent | |
| -50% Cutoff | 100% agreement | 100% Correct | Excellent | |
| -25% Cutoff | >90% agreement, with expected | 90% Correct | Acceptable, slight dip | |
| increase in discordance. | near cutoff. | |||
| +25% Cutoff | >90% agreement, with expected | 95% Correct | Acceptable, slight dip | |
| increase in discordance. | near cutoff. | |||
| +50% Cutoff | 100% agreement | 100% Correct | Excellent | |
| +75% Cutoff | 100% agreement | 100% Correct | Excellent |
2. Sample Size Used for the Test Set and Data Provenance
- Precision Study:
- Sample Size: 9 different concentrations, with 50 tests performed for each concentration per lot (2 runs per day for 25 days). Since 3 lots were tested, this amounts to 9 concentrations * 50 tests/lot * 3 lots = 1350 tests in total for the precision study itself. The samples were prepared by spiking drug in "negative samples." The provenance is not explicitly stated but implies laboratory-prepared samples.
- Comparison Studies (Clinical Samples):
- Sample Size: 80 unaltered clinical samples (40 negative and 40 positive).
- Data Provenance: The document states "unaltered clinical samples." The country of origin for these clinical samples is not specified. It is a retrospective analysis as the samples were collected and then tested.
- Lay-User Study:
- Sample Size: 140 lay persons tested individual samples. There were 7 concentration levels, with 20 samples per concentration. So, 7 concentrations * 20 samples/concentration = 140 samples in total.
- Data Provenance: The samples were "spiked drug THC into drug free-pooled urine specimens." The country of origin is not specified. It is a prospective study in the sense that the lay users tested the devices with prepared samples, but the samples themselves were laboratory-prepared.
3. Number of Experts Used to Establish the Ground Truth for the Test Set and Their Qualifications
- Precision Study: The ground truth was established by laboratory preparation of samples with known concentrations confirmed by LC/MS. No human experts are explicitly mentioned for ground truth.
- Comparison Studies (Clinical Samples): The ground truth was established by LC/MS results. "LC/MS is the preferred confirmatory method." The number of LC/MS operators or analysts is not specified, nor are their qualifications.
- Lay-User Study: The ground truth for the prepared urine samples was established by LC/MS. The number of LC/MS operators or analysts is not specified, nor are their qualifications.
4. Adjudication Method for the Test Set
- Precision Study: Not applicable, as results were quantitative (known concentrations) rather than subjective interpretations needing adjudication.
- Comparison Studies (Clinical Samples): The document mentions "three different laboratory assistants" performing the tests. Their results were compared to LC/MS. There is no explicit adjudication method stated for discrepancies between human readers or between human readers and LC/MS. The discordant results table simply lists them.
- Lay-User Study: Not explicitly stated. Each lay person provided their own result. Their individual results were then compared to the LC/MS confirmed concentration.
5. If a Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study Was Done, and the Effect Size of How Much Human Readers Improve with AI vs without AI Assistance
- No, an MRMC comparative effectiveness study was not done.
- This device is a standalone diagnostic strip test intended for visual interpretation, not an AI-assisted diagnostic tool. Therefore, there is no AI component or human readers improving with/without AI assistance.
6. If a Standalone (i.e. algorithm only without human-in-the-loop performance) Was Done
- Yes, in essence, the "device performance" in all studies represents a standalone performance relative to the ground truth (LC/MS). The device itself (the strip test) produces a visual result. While a human reads the result, the performance studies assess the accuracy of the device's output (presence/absence of a line) against known concentrations.
- For the "Comparison Studies," the performance of the "Safecare THC Urine Strip Test" is measured for each viewer by comparing their reading of the device against LC/MS. This measures the combined device-human performance.
- For the "Lay-User Study," it also measures the combined device-lay user performance.
7. The Type of Ground Truth Used
- For all performance studies (Precision, Comparison, Lay-User), the ground truth was primarily established by LC/MS (Liquid Chromatography-Mass Spectrometry). This is a highly accurate and quantitative laboratory method.
- For the precision study, it specifies "THC drug concentration was confirmed by LC/MS."
- For the comparison studies, it states "The samples were blind labeled and compared to LC/MS results. LC/MS is the preferred confirmatory method."
- For the lay-user study, it states "The concentrations of the samples were confirmed by LC/MS."
8. The Sample Size for the Training Set
- Based on the provided document, this is a 510(k) submission for a diagnostic device. Such submissions typically focus on analytical and clinical performance validation rather than explicitly detailing a "training set" for an algorithm.
- There is no information provided regarding a "training set" as this is not an AI/machine learning device. The immunoassay device relies on chemical reactions, not on data training.
9. How the Ground Truth for the Training Set Was Established
- As there is no mention of a "training set" or an algorithm that requires training, this question is not applicable based on the provided document.
{0}------------------------------------------------
Image /page/0/Picture/0 description: The image shows the logo of the U.S. Food and Drug Administration (FDA). On the left is the Department of Health & Human Services logo. To the right of that is the FDA logo, which is a blue square with the letters "FDA" in white. To the right of the blue square is the text "U.S. FOOD & DRUG ADMINISTRATION" in blue.
August 16, 2019
Safecare Biotech (Hangzhou) Co., Ltd. % Joe Shia, Manager LSI International 504 E Diamond Ave., Suite I Gaithersburg, MD 20877
Re: K191924
Trade/Device Name: SAFECARE® THC Urine Strip Test Regulation Number: 21 CFR 862.3870 Regulation Name: Cannabinoid test system Regulatory Class: Class II Product Code: NFW Dated: July 16, 2019 Received: July 18, 2019
Dear Joe 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. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database located at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. 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. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
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 and Part 809); medical device reporting of medical device-related adverse events) (21 CFR
{1}------------------------------------------------
- for devices or postmarketing safety reporting (21 CFR 4, Subpart B) for combination products (see
Page 2
https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reportingcombination-products); good manufacturing practice requirements as set forth in the quality systems (OS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
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 https://www.fda.gov/medical-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about medical devices and radiation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medicaldevices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (https://www.fda.gov/medical-device-advice-comprehensive-regulatoryassistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
Sincerely.
Kellie B. Kelm, Ph.D. Acting Director Division of Chemistry and Toxicology Devices OHT7: Office of In Vitro Diagnostics and Radiological Health Office of Product Evaluation and Quality Center for Devices and Radiological Health
Enclosure
{2}------------------------------------------------
Indications for Use
510(k) Number (if known) K191924
Device Name SAFECARE® THC Urine Strip Test
Indications for Use (Describe)
SAFECARE® THC Urine Strip Test is a competitive binding, lateral flow immunochromatographic assay for qualitative detection of Marijuana in human urine at the cutoff concentrations of 50 ng/mL.
The test provides only preliminary test results. A more specific alternative chemical must be used in order to obtain a confirmed analytical result. GC/MS or LC/MS is the preferred confirmatory method.
The test is intended for over-the-counter use.
| Type of Use (Select one or both, as applicable) | |
|---|---|
| ------------------------------------------------- | -- |
Prescription Use (Part 21 CFR 801 Subpart D)
|X | Over-The-Counter Use (21 CFR 801 Subpart C)
CONTINUE ON A SEPARATE PAGE IF NEEDED.
This section applies only to requirements of the Paperwork Reduction Act of 1995.
DO NOT SEND YOUR COMPLETED FORM TO THE PRA STAFF EMAIL ADDRESS BELOW.
The burden time for this collection of information is estimated to average 79 hours per response, including the time to review instructions, search existing data sources, gather and maintain the data needed and complete and review the collection of information. Send comments regarding this burden estimate or any other aspect of this information collection, including suggestions for reducing this burden, to:
Department of Health and Human Services Food and Drug Administration Office of Chief Information Officer Paperwork Reduction Act (PRA) Staff PRAStaff@fda.hhs.gov
"An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a currently valid OMB number."
{3}------------------------------------------------
K191924 510(k) SUMMARY
| 1. Date: | August 15, 2019 |
|---|---|
| 2. Submitter: | Safecare Biotech (Hangzhou) Co., Ltd18 Haishu Road, Yuhang DistrictHangzhou, China |
| 3. Contact person: | Joe ShiaLSI International Inc.504 East Diamond Ave.,Suite I, Gaithersburg, MD 20877Telephone: 301-250-0831Fax: 301-916-6213Email: jxia@lsi-consulting.org |
-
- Device Name: SAFECARE® THC Urine Strip Test
| ProductCode | CFR # | Panel |
|---|---|---|
| NFW | 21 CFR, 862.3870 Cannabinoid Test System | Toxicology |
-
- Predicate Devices:
K153646 SAFECARE Urine Test Marijuana
- Predicate Devices:
-
- Intended Use
SAFECARE® THC Urine Strip Test is a competitive binding, lateral flow immunochromatographic assay for qualitative detection of Marijuana in human urine at the cutoff concentrations of 50 ng/mL. The test provides only preliminary test results. A more specific alternative chemical must be used in order to obtain a confirmed analytical result. GC/MS is the preferred confirmatory method. The test is intended for over-the-counter use.
- Intended Use
-
- Device Description
SAFECARE® THC Urine Strip Test devices are immunochromatographic assays for the qualitative detection of 11-nor-A9-THC-9 COOH (target analyte) in human urine. The product is a single-use in
- Device Description
{4}------------------------------------------------
vitro diagnostic device. It contains a Test Device and a package insert. Each test device is sealed with a desiccant in an aluminum pouch.
-
- Substantial Equivalence Information
A summary comparison of features of the SAFECARE THC Urine Strip Test and the predicate device is provided in Table 1.
- Substantial Equivalence Information
| Item | Device | Predicate - K153646 |
|---|---|---|
| Indication(s)for Use | For the qualitative determination of 11-nor-Δ9-THC-9 COOH in human urine. | Same |
| Calibrator | 11-nor-Δ9-THC-9 COOH | Same |
| Methodology | Competitive binding, lateral flowimmunochromatographic assays basedon the principle of antigen antibodyimmunochemistry. | Same |
| Specimen Type | Human Urine | Same |
| Cut-Off Values | 50 ng/mL | Same |
| IntendedPopulation | For over-the-counter use. | For over-the-counteruse and prescriptionuses. |
| Configurations | Strip | Cup, Dip Card,Cassette |
| Table 1: Features Comparison of SAFECARE Marijuana Test and the Predicate Device | |||
|---|---|---|---|
9. Test Principle
SAFECARE THC Urine Strip Test devices are rapid tests for the qualitative detection of 11-nor-A9-THC-9 COOH in urine samples. Each assay test is a lateral flow chromatographic immunoassay. During testing, a urine specimen migrates upward by capillary action. If target drug THC is present in the urine specimen below its cut-off concentration, it will not saturate the binding sites of its specific antibody (monoclonal mouse antibody) coated on the particles. The antibody-coated particles will then be captured by immobilized drug-conjugate and a visible colored line will show up in the test line region. The colored line will not form in the test line region if the target drug level exceeds its cutoffconcentration because it will saturate all the binding sites of the antibody coated on the particles. A band should form in the control region of the devices regardless of the presence of drug or metabolite in the sample.
10. Performance Characteristics
{5}------------------------------------------------
1. Analytical Performance
a. Precision
Precision studies were carried out for samples with concentrations of -100% cut-off, -50% cut-off, -25% cut-off, at the cut-off, +25% cut-off, +75% cut-off, +75% cut-off and +100% cut-off. These samples were prepared by spiking drug in negative samples. THC drug concentration was confirmed by LC/MS. All sample aliquots were blinded labeled and randomized. For each concentration, tests were performed two runs per day for 25 days. The results obtained are summarized in the following tables:
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| Drug | Lot 1 | 50-/0+ | 50-/0+ | 50-/0+ | 50-/0+ | 25-/25+ | 50+/0- | 50+/0- | 50+/0- | 50+/0- |
| Drug | Lot 2 | 50-/0+ | 50-/0+ | 50-/0+ | 50-/0+ | 25-/25+ | 50+/0- | 50+/0- | 50+/0- | 50+/0- |
| Drug | Lot 3 | 50-/0+ | 50-/0+ | 50-/0+ | 50-/0+ | 26-/24+ | 50+/0- | 50+/0- | 50+/0- | 50+/0- |
The cut-off value of 50 ng/mL is verified for the device.
-
b. Linearity
Not applicable, these are visually read devices. -
c. Stability
The devices are stable at 4-30°C (39-86°F) for 24 months based on the accelerated stability study at 50°C. -
d. Interference
Potential interfering substances found in human urine of physiological or pathological conditions were added to drug-free urine and target drugs urine with concentration at 25% above cut-off levels. These urine samples were tested using three batches of the device.
Compounds that showed no interference at a concentration of 100µg/mL are summarized in the following tables.
| Acetaminophen | ß-Estradiol | Oxalic acid |
|---|---|---|
| Acetophenetidin | Erythromycin | Oxolinic acid |
| N-Acetylprocainamide | Ethanol (1% v/v) | Oxymetazoline |
| AcetyIsalicylic acid | Fenoprofen | Papaverine |
{6}------------------------------------------------
| Albumin (100 mg/dL) | Furosemide | Penicillin G |
|---|---|---|
| Aminopyrine | Gentisic acid | Perphenazine |
| Amoxicillin | Hemoglobin | Phenelzine |
| Ampicillin | Hydralazine | Prednisone |
| Apomorphine | Hydrochlorothiazide | (±)-Propranolol |
| Ascorbic acid | Hydrocortisone | D-Pseudoephedrine |
| Aspartame | O-Hydroxyhippuric acid | Quinine |
| Atropine | 3-Hydroxytyramine | Ranitidine |
| Benzilic acid | Ibuprofen | Salicylic acid |
| Benzoic acid | D,L-Isoproterenol | Serotonin (5- Hydroxytyramine) |
| Bilirubin | Isoxsuprine | Sulfamethazine |
| Chloral hydrate | Ketamine | Sulindac |
| Chloramphenicol | Ketoprofen | Tetrahydrocortisone 3-(β-Dglucuronide) |
| Chlorothiazide | Labetalol | Tetrahydrocortisone 3-acetate |
| Chlorpromazine | Loperamide | Tetrahydrozoline |
| Cholesterol | Meperidine | Thiamine |
| Clonidine | Meprobamate | Thioridazine |
| Cortisone | Methoxyphenamine | Triamterene |
| (-)-Cotinine | Nalidixic acid | Trifluoperazine |
| Creatinine | Naloxone | Trimethoprim |
| Deoxycorticosterone | Naltrexone | DL-Tryptophan |
| Dextromethorphan | Naproxen | Tyramine |
| Diclofenac | Niacinamide | DL-Tyrosine |
| Diflunisal | Nifedipine | Uric acid |
| Digoxin | Norethindrone | Verapamil |
| Diphenhydramine | Noscapine | Zomepirac |
| Ecgonine methyl ester | (±)-Octopamine |
e. Specificity
To test the specificity, drug metabolites and other components that are likely to interfere in urine samples were tested using three batches of the device. The obtained lowest detectable concentration was used to calculate the cross-reactivity.
| Drugs | Cross Reactivity Cut off(ng/ml) | % Cross-Reactivity |
|---|---|---|
| 11-Nor-△9-Tetrahydrocannabinol-9-COOH | 50 | 100% |
| 11-Hydroxy-△9-Tetrahydrocannabinol | 5000 | 1% |
| 11-Nor-△8-Tetrahydrocannabinol-9-COOH | 50 | 100% |
{7}------------------------------------------------
| Cannabinol | 20000 | 0.25% |
|---|---|---|
| △8-Tetrahydrocannabinol | 10000 | 0.5% |
| △9-Tetrahydrocannabinol | 10000 | 0.5% |
| Cannabidiol | 20000 | 0.25% |
| 11-Nor-△9-THC-carboxy glucuronide | 2500 | 2% |
| (-)-11-nor-9-carboxy-△ 9-THC | 2500 | 2% |
f. Effect of Urine Specific Gravity and Urine pH
To investigate the effect of urine specific gravity and urine samples with of 1.000 to 1.035 specific gravity or urine samples with pH 4 to 9 were spiked with target drug THC at 25% below and 25% above cut-off levels. These samples were tested using three batches of device. Results were all positive for samples at and above +25% cut-off and all negative for samples at and below -25% Cut-Off.
-
- Comparison Studies
The method comparison studies for the SAFECARE THC Urine Strip Test were performed by three different laboratory assistants. Operators ran 80 (40 negative and 40 positive) unaltered clinical samples. The samples were blind labeled and compared to LC/MS results. The results are presented in the tables below:
- Comparison Studies
| SafecareTHCUrineStrip Test | Negative | LowNegativeby LC/MS(less than -50%) | Near CutoffNegative byLC/MS(Between -50% and cut-off) | Near CutoffPositive byLC/MS(Betweenthe cut-offand +50%) | HighPositive byLC/MS(greaterthan+50%) | |
|---|---|---|---|---|---|---|
| Viewer A | Positive | 0 | 0 | 1 | 18 | 20 |
| Negative | 10 | 10 | 19 | 2 | 0 | |
| Viewer B | Positive | 0 | 0 | 1 | 19 | 20 |
| Negative | 10 | 10 | 19 | 1 | 0 | |
| Viewer C | Positive | 0 | 0 | 0 | 19 | 20 |
| Negative | 10 | 10 | 20 | 1 | 0 |
Discordant Results
| Viewer | Sample Number | LC/MS Result | Viewer Results |
|---|---|---|---|
| Viewer A | MT540 | 49 | Positive |
| Viewer B | MT630 | 48 | Positive |
| Viewer A | MT299 | 51 | Negative |
| Viewer A | MT527 | 52 | Negative |
| Viewer B | MT527 | 52 | Negative |
| Viewer C | MT527 | 52 | Negative |
{8}------------------------------------------------
Lay-user study
A lay user study was performed at three intended user sites with 140 lay persons testing the devices. A total of 69 females and 71 males tested the marijuana samples. They had diverse educational and professional backgrounds and ranged in age from 21 to > 50 years. Urine samples were prepared at the following concentrations; negative, +/-75%, +/-50%, +/-25% of the cutoff by spiking drug THC into drug free-pooled urine specimens. The concentrations of the samples were confirmed by LC/MS. Each sample was aliquoted into individual containers and blind-labeled. Each participant was provided with the package insert, 1 blind labeled sample and a device. The results are summarized below.
| % of Cutoff | Number of samples | 11-nor-D9-THC-9-COOHConcentration by LC/MS(ng/mL) | Lay person results | Thepercentage ofcorrect results(%) | |
|---|---|---|---|---|---|
| No. ofPositive | No. ofNegative | ||||
| -100% Cutoff | 20 | 0 | 0 | 20 | 100 |
| -75% Cutoff | 20 | 13 | 0 | 20 | 100 |
| -50% Cutoff | 20 | 25 | 0 | 20 | 100 |
| -25% Cutoff | 20 | 37 | 2 | 18 | 90 |
| +25% Cutoff | 20 | 63 | 19 | 1 | 95 |
| +50% Cutoff | 20 | 76 | 20 | 0 | 100 |
| +75% Cutoff | 20 | 88 | 20 | 0 | 100 |
Comparison between LC/MS and Lay Person Results
Lay-users were also given surveys on the ease of understanding the package insert instructions. All lay users indicated that the device instructions can be easily followed. A Flesch-Kincaid reading analysis was performed on each package insert and the scores revealed a reading Grade Level of 7.
3. Clinical Studies
Not applicable.
11.Conclusion
Based on the test principle and acceptable performance characteristics including precision, interference, specificity and method comparison of the device, it's concluded that the SAFECARE THC Urine Strip Test devices are substantially equivalent to the predicate.
§ 862.3870 Cannabinoid test system.
(a)
Identification. A cannabinoid test system is a device intended to measure any of the cannabinoids, hallucinogenic compounds endogenous to marihuana, in serum, plasma, saliva, and urine. Cannabinoid compounds includedelta -9-tetrahydrocannabinol, cannabidiol, cannabinol, and cannabichromene. Measurements obtained by this device are used in the diagnosis and treatment of cannabinoid use or abuse and in monitoring levels of cannabinoids during clinical investigational use.(b)
Classification. Class II (special controls). A cannabinoid 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).