The Aptima Chlamydia trachomatis (CT) assay is an in vitro qualitative nucleic acid amplification test (NAAT) for the detection of ribosomal RNA (rRNA) from Chlamydia trachomatis to aid in the diagnosis of chlamydia urogenital disease using the Panther System.

The assay may be used to test the following specimens from symptomatic individuals: patient-collected vaginal swab specimens1 (in a clinical setting); and female and male urine specimens.

1 Patient-collected vaginal swab specimens are an option for screening women when a pelvic exam is not otherwise indicated. The Aptima Multitest Swab Specimen Collection Kit has not been evaluated for home use.

Device Description

The Aptima Chlamydia trachomatis assay (Aptima CT assay) is a target amplification nucleic acid probe test for in vitro qualitative detection of ribosomal RNA (rRNA) from Chlamydia trachomatis (CT). The Aptima CT assay combines the technologies of target capture, transcription-mediated amplification (TMA), and hybridization protection assay (HPA).

Specimens are collected and transferred into their respective specimen transport tubes. The transport solution in these tubes releases the rRNA target and protects it from degradation during storage. When the Aptima CT assay is performed in the laboratory, the target rRNA molecule is isolated from the specimens by use of a capture oligomer via target capture that utilizes magnetic microparticles. The capture oligomer contains a sequence complementary to a specific region of the target molecule as well as a string of deoxyadenosine residues. During the hybridization step, the sequence specific region of the capture oligomer binds to a specific region of the target molecule. The capture oligomer:target complex is then captured out of solution by decreasing the temperature of the reaction to room temperature reduction allows hybridization to occur between the deoxyadenosine region on the capture oligomer and the polydeoxythymidine molecules that are covalently attached to the magnetic particles. The micro particles, including the captured target molecule bound to them, are pulled to the side of the reaction vessel using magnets and the supernatant is aspirated. The particles are washed to remove residual specimen matrix that may contain amplification reaction inhibitors. After the target capture steps are completed, the specimens are ready for amplification.

Target amplification assays are based on the ability of complementary oligonucleotide primers to specifically anneal and allow enzymatic amplification of the target nucleic acid strands. The Hologic TMA reaction replicates a specific region of the 16S rRNA from CT via DNA intermediates. A unique set of primers is used for the target molecule. Detection of the rRNA amplification product sequences (amplicon) is achieved using nucleic acid hybridization. A single-stranded chemiluminescent DNA probe, which is complementary to a region of the target amplicon, is labeled with an acridinium ester molecule. The labeled DNA probe combines with amplicon to form stable RNA:DNA hybrids. The Selection Reagent differentiates hybridized from unhybridized probe, eliminating the generation of signal from unhybridized probe. During the detection step, light emitted from the labeled RNA:DNA hybrids is measured as photon signals in a luminometer and are reported as Relative Light Units (RLU).

The device reagents are identical to the Aptima CT assay reagents for use on the Tigris DTS® system but are intended for use on the Panther system with different specimen type indications. The Panther and Tigris DTS systems use the same principles of operation.

AI/ML Overview

The provided document is a 510(k) summary for the Aptima Chlamydia trachomatis Assay, which focuses on demonstrating substantial equivalence to a predicate device. It details various analytical and clinical studies conducted to support the performance of the assay on the Panther system.

Here's an analysis of the acceptance criteria and the study that proves the device meets them, based on the provided text:

1. A table of acceptance criteria and the reported device performance

The document does not present a single, comprehensive table outlining pre-defined acceptance criteria for each study and then directly reporting the device's performance against those criteria in a tabular format. Instead, acceptance criteria are generally described within the text of each study and the conclusion states whether those criteria were met.

However, based on the descriptions, we can infer some acceptance criteria and the reported performance.

Study Type	Acceptance Criteria (Inferred/Stated)	Reported Device Performance
Analytical Studies
Within-lab Precision Study	Percent agreement to expected results for all panels to be high (e.g., typically >95-100%)	100% agreement to expected results for all panels.
Limit of Detection (LoD) Study	LoD to be defined as the target concentration detectable in 95% of replicates. Specific LoD values for CT serovars must be demonstrated.	LoD for serovar E is 0.00267 IFU/mL; for serovar G is 0.00441 IFU/mL (detected in 95% of replicates).
Analytical Sensitivity and Specificity Study	Overall acceptance criteria for the study must be met. Samples tested with CT RNA at specified concentrations must yield positive results. Lower bound of 95% score confidence interval for percent agreement >= 95%.	All acceptance criteria were met. 100% agreement to expected results for all panels. Lower bound of the one-sided 95% score confidence interval for percent agreement for each panel were greater than or equal to 95%. Positive results when CT RNA was present at concentrations equivalent to 2.5 IFU/mL (1 IFU/assay; 5 fg of CT rRNA/assay).
Carryover Study	Low carryover rate (e.g., typically < 1%) with an acceptable 95% confidence interval.	Overall carryover rate was 0.19% with a 95% confidence interval of 0.10-0.33%.
Run-Size Validity	100% agreement with expected results for negative and positive panel members, with no front-to-back effects.	Negative and Positive panel member results produced 100% agreement with the expected results, with no difference in performance between the front and back of the runs.
Control Validity	Run controls meet performance criteria and properly control for run validity over the allowed timeframe (24 hours + 25%).	Acceptance criteria for this study were met. Control RLUs were within the expected range, and controls properly determined run validity over the 24-hour control validity timeframe.
Control Effectiveness	Control performance correctly predicts sample results under fault conditions.	Performance of the CT Controls correctly predicted the sample results in 8 out of 8 of the conditions tested. Results met the acceptance criteria and demonstrated proper function under fault conditions not detected by system process controls.
Environmental Conditions	Meets performance requirements at the limits of Panther system environmental conditions (15-30°C, 20-85% RH).	Negative and Positive panel member results produced 100% agreement with the expected results. The device meets performance requirements at the specified environmental limits.
Reproducibility Study	High agreement with expected results for all panel members across sites, operators, and lots. Acceptable signal variability (CVs).	Agreement with expected results was 100% for all panel members. Signal variability data (SD and CV%) were presented for Between Sites, Between Operators, Between Lots, Between Runs, Within Runs, and Overall, demonstrating acceptable reproducibility (e.g., overall CV for very low positive was 4.5%, low positive 5.0%, high positive 4.8%).
Clinical Studies
Clinical Performance Study	Demonstrated performance characteristics (sensitivity, specificity, PPV, NPV) relative to a specimen-specific Patient Infected Status (PIS) for vaginal swabs, and male and female urine specimens. Must be consistent with current expectations for CT testing and safe/effective for intended use.	Performance was estimated relative to specimen-specific PIS for each specimen type. The study aimed to establish clinical performance characteristics. The conclusion states "All study results demonstrated that the performance of the Aptima CT assay on the Panther system is consistent with current expectations for CT testing, and that the assay is safe and effective for its intended use." (Specific numerical performance metrics for sensitivity, specificity, PPV, NPV were not provided in this summary but were likely part of the detailed submission).

2. Sample size used for the test set and the data provenance

Clinical Performance Study Test Set Sample Size:
- Evaluated subjects: 4247 (2283 women, 1964 men).
- Total specimens analyzed for PIS comparison: 6415 specimens.
  - 2265 patient-collected vaginal swabs
  - 2186 female urine
  - 1964 male urine
Data Provenance:
- Country of origin: US (11 geographically and ethnically diverse US clinical sites).
- Type of study: Prospective, multicenter clinical study.

3. Number of experts used to establish the ground truth for the test set and the qualifications of those experts

The document states that the Patient Infected Status (PIS) was established by testing specimens with up to 3 FDA-cleared NAATs. It does not explicitly mention the use of human "experts" or their qualifications for establishing the ground truth in the traditional sense of medical image interpretation or pathology review. The ground truth (PIS) for this diagnostic assay is determined by the results of multiple, already-cleared, highly sensitive and specific nucleic acid amplification tests.

4. Adjudication method for the test set

The ground truth (PIS) was established using multiple FDA-cleared NAATs. The method described is:

Male urine PIS was derived from male urine specimens.
Female urine PIS was derived from female urine specimens.
Vaginal swab PIS was derived from vaginal swab and female urine specimens.

This implies a composite reference standard approach (CRS), where the combination of results from multiple established tests determines the "true" infection status. It's not a human expert adjudication method like "2+1" for discordant readings.

5. If a multi reader multi case (MRMC) comparative effectiveness study was done, If so, what was the effect size of how much human readers improve with AI vs without AI assistance

No MRMC study was done, and this question is not applicable. The Aptima Chlamydia trachomatis Assay is an in vitro diagnostic (IVD) device, specifically a nucleic acid amplification test (NAAT). It does not involve human readers interpreting images or data where AI assistance would be relevant. The test provides a qualitative result ("detected" or "not detected").

6. If a standalone (i.e. algorithm only without human-in-the-loop performance) was done

This question is also largely not applicable in the context of an IVD NAAT. The "device" (Aptima CT assay on the Panther system) is the standalone algorithm/system. The test is fully automated on the Panther system, providing results without human interpretation of raw signals; humans perform sample loading, system operation, and result review. The analytical and clinical studies described effectively demonstrate its standalone performance.

7. The type of ground truth used (expert consensus, pathology, outcomes data, etc.)

The ground truth used was a composite reference standard (CRS), specifically the Patient Infected Status (PIS) derived from the results of up to 3 FDA-cleared NAATs for each specimen type. This is a common and accepted method for establishing ground truth for IVD assays.

8. The sample size for the training set

The document does not explicitly state a sample size for a "training set." This is typical for an IVD submission focusing on performance characterization for market clearance, rather than an AI/ML device which requires distinct training, validation, and test datasets. The studies described are primarily for validation and verification of the device's performance. The development and optimization of the assay happened prior to these studies, likely using various internal samples, but not separated into a formally reported "training set" like in machine learning contexts.

9. How the ground truth for the training set was established

Since a formal "training set" with separate ground truth establishment is not explicitly mentioned or relevant in the context provided (it's not an AI/ML device), this information is not available in the document. The development of such assays typically involves extensive R&D where assay components, target sequences, and amplification conditions are optimized, but this often doesn't fit the 'ground truth for a training set' paradigm as understood in AI regulation.

Summary

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November 16, 2023

Image /page/0/Picture/1 description: The image contains 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.

Hologic, Inc. Jon Kukowski Regulatory Affairs Specialist 10210 Genetic Center Drive San Diego, California 92121

Re: K230451

Trade/Device Name: Aptima Chlamydia trachomatis Assay Regulation Number: 21 CFR 866.3120 Regulation Name: Chlamydia Serological Reagents Regulatory Class: Class I, reserved Product Code: MKZ Dated: February 16, 2023 Received: February 21, 2023

Dear Jon Kukowski:

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 (the 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 available 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

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Part 803) for devices or postmarketing safety reporting (21 CFR Part 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safetyreporting-combination-products); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR Part 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR Parts 1000-1050.

Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 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 mediation-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. Himani Bisht -S

Himani Bisht, Ph.D. Assistant Director Viral Respiratory and HPV Branch Division of Microbiology Devices OHT7: Office of In Vitro Diagnostics and Radiological Health Office of Product Evaluation and Quality Center for Devices and Radiological Health

Enclosure

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Indications for Use

510(k) Number (if known) K230451

Device Name Aptima Chlamydia trachomatis Assay

Indications for Use (Describe)

The assay may be used to test the following specimens from symptomatic individuals: patient-collected vaginal swab specimens1 (in a clinical setting); and female and male urine specimens.

Type of Use (Select one or both, as applicable)
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X Prescription Use (Part 21 CFR 801 Subpart D)

| Over-The-Counter Use (21 CFR 801 Subpart C)

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510(k) Summary

Contact Details

Applicant Name: Hologic, Inc. Applicant Address: 10210 Genetic Center Drive San Diego CA 92121 United States Applicant Contact Telephone: 858-410-8245 Applicant Contact: Jon Kukowski Applicant Contact Email: jonathan.kukowski@hologic.com

Device Name

Device Trade Name: Aptima Chlamydia trachomatis Assay Common Name: Aptima CT Assay Classification Name: DNA Probe, Nucleic Acid Amplification, Chlamydia Regulation Number: 866.3120 Regulatory Class: Class I Product Code: MKZ

Legally Marketed Predicate Devices

Predicate #: K063451

Predicate Trade Name: Aptima Assay for Chlamydia trachomatis

Product Code: MKZ

Device Description Summary

Clearance of this pre-market application will allow the Aptima® Chlamydia trachomatis (CT) assay to be performed on the Panther® system using patient-collected vaginal swab specimens and female and male urine specimens.

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storage. When the Aptima CT assay is performed in the laboratory, the target rRNA molecule is isolated from the specimens by use of a capture oligomer via target capture that utilizes magnetic microparticles. The capture oligomer contains a sequence complementary to a specific region of the target molecule as well as a string of deoxyadenosine residues. During the hybridization step, the sequence specific region of the capture oligomer binds to a specific region of the target molecule. The capture oligomer:target complex is then captured out of solution by decreasing the temperature of the reaction to room temperature reduction allows hybridization to occur between the deoxyadenosine region on the capture oligomer and the polydeoxythymidine molecules that are covalently attached to the magnetic particles. The micro particles, including the captured target molecule bound to them, are pulled to the side of the reaction vessel using magnets and the supernatant is aspirated. The particles are washed to remove residual specimen matrix that may contain amplification reaction inhibitors. After the target capture steps are completed, the specimens are ready for amplification.

Intended Use

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The Aptima® Chlamydia trachomatis (CT) assay is an in vitro qualitative nucleic acid amplification test (NAAT) for the detection of ribosomal RNA (rRNA) from Chlamydia trachomatis to aid in the diagnosis of chlamydial urogenital disease using the Panther system.

The assay may be used to test the following specimens from symptomatic or asymptomatic individuals: patient-collected vaginal swab specimens1 (in a clinical setting); and female and male urine specimens.

Indications for Use Comparison

This pre-market application is to clear the Aptima CT assay on an additional platform, the Panther system, for use with selected cleared and new specimen type indications. The analytical and clinical study results demonstrate that the Aptima CT assay on the Panther system performs comparably to the predicate device in detecting rRNA of CT from the designated specimen types and support a substantial equivalence decision.

Technological Comparison

The Aptima CT assay incorporates the technologies of target capture, Transcription-Mediated Amplification (TMA), and Hybridization Protection Assay (HPA), which have been previously described in 510(k) submission K043072 for the Aptima CT assay, cleared in January 2005. The Aptima CT assay and system technologies remain unchanged with this submission, including all biochemical (e.g., in vitro nucleic acid probe test) and physical detection (e.g., chemiluminescence) technologies.

Non-Clinical and/or Clinical Tests Summary & Conclusions

The following studies were conducted to support analytical performance of the Aptima CT assay on the Panther system using patient-collected vaginal swab, and female and male urine specimens.

Analytical Studies

Within-lab Precision Study

510(k) Summary Original 510(k) Application

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Precision was determined using panels made by spiking CT organisms or equivalent RNA into Swab Transport Media (STM) at concentrations below, at, or above the analytical sensitivity claim in the package insert. Testing was performed on three Panther instruments. The negative panel member consisted of specimen transport medium (STM) only. The CT positive panel members were created by spiking STM with CT positive cells diluted in STM to achieve the appropriate targeted concentrations ranging from 0.25 IFU/mL to 2,500 IFU/mL. The percent agreement to expected results for all panels was 100%.

Limit of Detection Study

The limit of detection (LoD) was tested and confirmed with sensitivity panels prepared using CT serovars E and G spiked into pooled negative vaginal swab matrix. Sensitivity panels were tested on two Panther instruments with two reagent lots. At least 25 replicates were run for each concentration for each reagent lot for each serovar. LoD, defined as the target concentration that can be detected in 95% of the replicates tested for vaginal swab specimens, is 0.00267 IFU/mL for serovar E and 0.00441 IFU/mL for serovar G.

Analytical Sensitivity and Specificity Study

Analytical sensitivity and specificity was determined using panels made by spiking CT organisms or equivalent RNA into matrix pools. Analytical sensitivity using a variety of CT serovars have been previously established and shown to be equivalent for all types tested. Analytical specificity in the presence of closely related organisms was also previously established. For the purposes of this sensitivity study a single CT serovar was tested; specificity was confirmed using negative clinical pools. Pooled urine was used to determine analytical sensitivity and specificity. Analytical sensitivity was confirmed using separate pools of vaginal swabs and Specimen Transport Media (STM). All acceptance criteria for this study were met. Samples tested by the Aptima CT assay yielded a positive result when CT RNA was present at concentrations equivalent to 2.5 IFU/mL (1 IFU/assay; 5 fg of CT rRNA/assay). The percent agreement to expected results for all panels was 100%. The lower bound of the one-sided 95% score confidence interval for percent agreement for each panel were greater than or equal to 95%.

Carryover Study

510(k) Summary Original 510(k) Application

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A multi-run analytical study was conducted using spiked panels on six Panther systems. Carryover was assessed using approximately 20% high titer CT samples dispersed between negative samples. The runs included clusters of high positive samples with clusters of negative samples as well as single high positives dispersed within the run. High titer samples were made using CT rRNA spiked into STM to give a final concentration of 5 x 105 fg rRNA/reaction (rRNA equivalent of 2.5 x 105 IFU/mL). Testing was carried out using 5 runs on each of six Panther systems with a total of 5878 negative samples. The overall carryover rate was 0.19% with a 95% confidence interval of 0.10-0.33%.

Run-Size Validity

This study was to confirm that there are no front-to-back positional effects within a run for the Aptima CT assay on the Panther system. Panels and controls with known concentrations were tested and results were examined for front-to-back effects when compared to expected results. Negative and Positive panel member results produced 100% agreement with the expected results, with no difference in performance between the front and back of the runs.

Control Validity

This study was to demonstrate that Aptima CT assay run controls meet performance criteria and properly control for run validity over the timeframe allowed by the Panther software. The acceptance criteria for this study were met. Results at time-point 0 hour and time-point 30 hour (24 hours + 25%) yielded the expected results for the study and the control RLUs were within the expected range. Run controls met performance criteria and properly control for run validity over the 24-hours control validity timeframe allowed by the Panther software.

Control Effectiveness

This study was to demonstrate that the Aptima CT assay run controls are properly invalidated under fault conditions that are not detected by instrument process controls and that may exist during assay processing. The performance of the CT Controls correctly predicted the sample results in 8 out of 8 of the conditions tested for the assay when run on the Panther system. Results met the acceptance criteria of the study and demonstrated that performance of the Aptima CT assay controls properly determine run and test validity under fault conditions that are not detected by Panther system process controls.

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Environmental Conditions

This study was to demonstrate that the Aptima CT assay on the Panther system meets performance requirements at the limits of Panther system environmental conditions for external ambient temperature (15-30℃) and relative humidity (20-85%) specifications. Target panels at or below the sensitivity claims for the assays were tested. Negative and Positive panel member results produced 100% agreement with the expected results. The Aptima CT assay on the Panther system meets performance requirements at the limits of Panther system environmental conditions for external ambient temperature (15-30°C) and relative humidity (20-85%) specifications.

Reproducibility Study

Aptima CT assay reproducibility was evaluated on the Panther system at two external US laboratories and at Hologic. Testing was performed using two lots of assay reagents and a total of six operators (two at each site). At each site, testing was performed over at least six days.

The negative panel member consisted of specimen transport medium (STM) only. The CT positive panel members were created by spiking STM with CT positive cells diluted in STM to achieve the appropriate targeted concentrations (very low positive, or high positive). Final CT concentrations ranged from 0.25 IFU/mL to 25 IFU/mL. The agreement with expected results was 100% for all panel members.

Table 1 shows the signal variability of assay RLU results for each panel member between sites, between operators, between lots, between runs, within runs, and overall (Total). Only samples with valid results were included in the analyses.

Concentration	Target Conc.(IFU/mL)	N	Mean RLU(x1000)	Between Sites		BetweenOperators		Between Lots		Between Runs		Within Runs		Totals
				SD	CV (%)	SD	CV (%)	SD	CV (%)	SD	CV (%)	SD	CV (%)	SD	CV (%)
Negative	0	107	1.5	0.8	49.7	0.0	0.0	0.0	0.0	0.1	4.9	1.5	101.1	1.7	112.8
Very LowPositive	0.25	108	7339.0	272.0	3.7	0.0	0.0	80.0	1.1	98.2	1.3	142.0	1.9	331.9	4.5
Low Positive	2.5	108	7387.6	307.8	4.2	0.0	0.0	97.9	1.3	139.9	1.9	114.0	1.5	370.0	5.0
High Positive	25	107	7424.4	285.6	3.8	39.6	0.5	136.9	1.8	91.3	1.2	138.7	1.9	359.8	4.8

Table 1: Reproducibility Study Data: Signal Variabilitv bv Panel Member

CV = coefficient of variation, RLU = relative light unit, SD = standard deviation.

Notes: The RLU value reported by the software is the total measured RLU divided by 1000 with the decimal point truncated. Variability from some factors may be numerically negative. In these cases, SD and CV are shown as 0.0.

1One invalid result was excluded from the analysis.

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Clinical Studies

Clinical Performance Study

A prospective, multicenter clinical study was conducted to establish the clinical performance characteristics of the Aptima CT assay on the Panther system. Specimens were collected from 4413 symptomatic and asymptomatic women and men enrolled at 11 geographically and ethnically diverse US clinical sites, including obstetrics and gynecology, family planning, and STI clinics. Subjects were classified as symptomatic if symptoms were reported by the subject. Subjects were classified as asymptomatic if the subject did not report symptoms. One hundred sixty-six (166) enrolled subjects were not evaluable (28 were withdrawn and 138 did not have at least one specimen with a valid non-excluded Aptima result and a conclusive infected status). Of the 4247 evaluable subjects, 2283 were women and 1964 were men. The average age among evaluable study subjects was 34.5 years (range = 14 to 84 years). Symptoms were reported in 45.7% (1939/4247) of the evaluable subjects.

Up to 5 specimens were collected from each female subject (4 patient-collected vaginal swab, 1 first-catch urine), and 1 first-catch urine specimens was collected from each male subject. All specimens were collected by the subject at the clinical sites.

Specimens were tested with the Aptima CT assay on the Panther system. Specimens with initial equivocal or invalid Aptima CT assay results or instrument processing errors were retested, volume permitting; valid retest results were included in the performance analyses. Patientcollected vaginal swabs and male and female urine specimens were tested with up to 3 FDAcleared NAATs to establish the specimen specific patient infected status (PIS) as follows:

Male urine PIS was derived from male urine specimens
Female urine CCA was derived from female urine specimens
Vaginal swab PIS was derived from vaginal swab and female urine specimens

Performance of the Aptima CT assay was estimated relative to the specimen-specific PIS for each of the specimen types. Of the specimens collected, 6592 were processed in valid Aptima CT assay runs, including 213 (3.2%) that had to be retested due to invalid results. Overall, 6561 (99.5%) had final valid results and 31 (0.5%) had final invalid results and were excluded from the analyses. A total of 6415 specimens from 4247 evaluable subjects were included in the

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analyses comparing Aptima CT assay results to the PIS: 2265 patient-collected vaginal swabs, 2186 female urine, and 1964 male urine specimens.

Analytical and clinical studies performed with the Aptima CT assay on the Panther system to ensure the device meets the safety and effectiveness requirements and to confirm that the automated Panther system produced equivalent results to the previously cleared automated Tigris system. All study results demonstrated that the performance of the Aptima CT assay on the Panther system is consistent with current expectations for CT testing, and that the assay is safe and effective for its intended use.

Conclusion

Regulation Number and Section

§ 866.3120 Chlamydia serological reagents.

(a)
Identification. Chlamydia serological reagents are devices that consist of antigens and antisera used in serological tests to identify antibodies to chlamydia in serum. Additionally, some of these reagents consist of chlamydia antisera conjugated with a fluorescent dye used to identify chlamydia directly from clinical specimens or cultured isolates derived from clinical specimens. The identification aids in the diagnosis of disease caused by bacteria belonging to the genusChlamydia and provides epidemiological information on these diseases. Chlamydia are the causative agents of psittacosis (a form of pneumonia), lymphogranuloma venereum (a venereal disease), and trachoma (a chronic disease of the eye and eyelid).(b)
Classification. Class I (general controls).