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ST AIA-PACK DHEA-S Calibrator Set is designed for IN VITRO DIAGNOSTIC USE ONLY for the calibration of the ST AIA-PACK DHEA-S assay on Tosoh AIA System Analyzers

Device Description

The ST AIA-PACK DHEA-S CALIBRATOR SET contains human sera with assigned levels of DHEA-S. Calibration should be performed according to the schedule indicated in the TOSOH AIA System Operator's Manual.

2 x 1 mL 0 ug/dL ST AIA-PACK DHEA-S CALIBRATOR (1) Human serum containing no detectable concentration of DHEA-S with sodium azide as a preservative.

2 x 1 mL ST AIA-PACK DHEA-S CALIBRATOR (2) 5.0 µg/dL (approx.)
ST AIA-PACK DHEA-S CALIBRATOR (3) 12 µg/dL (approx.)
ST AIA-PACK DHEA-S CALIBRATOR (4) 60 µg/dL (approx.)
ST AIA-PACK DHEA-S CALIBRATOR (5) 300 µg/dL (approx.)
ST AIA-PACK DHEA-S CALIBRATOR (6) 1200 µg/dL (approx.)

Human serum containing the assigned concentration of DHEA-S (described on each vial) with sodium azide as a preservative.

AI/ML Overview

The provided document does not contain information about acceptance criteria or a study proving the device meets acceptance criteria in the typical sense of algorithm performance metrics (e.g., sensitivity, specificity for classification tasks).

This document is an Abbreviated 510(k) Summary for a medical device (ST AIA-PACK DHEA-S Calibrator Set) used as a calibrator for an assay, not an AI/ML powered diagnostic device.

Therefore, many of the requested fields are not applicable in this context. However, I can extract the relevant information from the document regarding the device's characteristics and its comparison to a predicate device for substantial equivalence.

Here's the breakdown of the information available:

Acceptance Criteria and Device Performance Study (as applicable)

This document details a substantial equivalence comparison to a legally marketed predicate device (Access DHEA-S Calibrators, K040181) for the purpose of 510(k) clearance, not a study evaluating specific performance metrics against pre-defined acceptance criteria for a diagnostic algorithm.

The "acceptance criteria" here are implicitly related to demonstrating that the new device's characteristics and performance are sufficiently similar to the predicate device, as confirmed by the FDA's substantial equivalence determination. The "reported device performance" refers to the characteristics of the calibrator set itself.

The study described is a comparative effectiveness study against a predicate device's specifications, rather than a clinical trial or algorithm performance study.

1. Table of Acceptance Criteria and Reported Device Performance

Characteristic	Predicate (Access® DHEA-S Calibrators, K040181)	Reported Device Performance (Tosoh ST AIA-PACK DHEA-S Calibrator Set)	Notes/Acceptance Criteria Implication
Intended Use	Calibrate the Access DHEA-S assay for quantitative determination of DHEA-S levels in human serum and plasma.	Intended for IN VITRO DIAGNOSTIC USE ONLY for the calibration of the ST AIA-PACK DHEA-S assay.	Demonstrated to be similar, for the calibration of a DHEA-S assay.
Analyte	DHEA-S	DHEA-S	Identical.
Analyzer	Beckman Coulter Access Immunoassay System	Tosoh AIA Systems	Different, but expected for a new calibrator system designed for a specific manufacturer's assay. This is a characteristic, not a performance metric for the calibrator directly.
Levels (approx.)	Six: 0, 20, 50, 200, 500, 1000 µg/mL	Six: 0, 5, 12, 60, 300, 1200 µg/mL	Different concentration ranges, but both provide six levels for calibration. This difference is accepted as part of product specificity.
Format	Ready to use liquid calibrators; Six two-mL bottles.	Ready to use liquid calibrators; Six one-mL bottles.	Similar format, volume difference is noted.
Assay Protocol	Competitive immunoenzymatic	Same (Competitive immunoenzymatic)	Identical.
Chemistry	Bovine serum / buffer base with surfactant and preservative	Human serum base with sodium azide preservative	Different base matrix (bovine vs. human) and preservative. This difference required evaluation but was deemed acceptable for substantial equivalence.
Traceability	Traceable to the manufacturer's working calibrators.	Same (Traceable to the manufacturer's working calibrators).	Identical.
Matrix	Serum, Plasma	Serum, Heparinized plasma, EDTA plasma (Citrated plasma cannot be used)	Broader matrix compatibility for the new device compared to the predicate, with a specific exclusion. This is a characteristic difference.
Storage	Store in upright and refrigerate at 2 to 10°C.	Store in upright position at 2-8°C when not in use.	Similar storage requirements.
Stability (un-opened)	Stable until expiration date on label when stored at 2-10°C.	Stable until expiration date on label when stored unopened and refrigerated at 2-8°C.	Similar.
Stability (opened)	Vial is stable at 2-10°C for 28 days after initial use.	Calibrator materials should be used within 1 day of opening, provided vials are kept tightly sealed and refrigerated at 2-8°C.	A significant difference in opened vial stability (28 days vs. 1 day). This difference was accepted, likely due to differences in formulation or stability profile, and addressed via labeling.
Shelf-life	12 months when stored unopened and refrigerated at 2-8°C.	12 months when stored unopened and refrigerated at 2-8°C.	Identical.
Calibration Stability	Assay calibration data are valid up to 28 days.	Stable up to 90 days.	The new device offers significantly longer calibration stability (90 days vs. 28 days), which is an improvement and thus acceptable.

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

Sample Size: Not explicitly stated in terms of a "test set" for performance evaluation, as this is a calibrator, not a diagnostic test with patient samples. The information covers the characteristics of the calibrator itself and its intended use.
Data Provenance: Not applicable in the context of patient data. The summary describes the physical characteristics and stability profiles of the calibrator set.

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

Number of Experts/Qualifications: Not applicable. This is not a study involving human interpretation or ground truth establishment by experts for a diagnostic algorithm. The "ground truth" for a calibrator would be its assigned concentration values, which are typically established by the manufacturer through rigorous analytical methods traceable to primary standards, not expert consensus in the diagnostic sense.

4. Adjudication method (e.g. 2+1, 3+1, none) for the test set

Adjudication Method: Not applicable. There is no "test set" requiring adjudication by human experts in this context.

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

MRMC Study / AI Assistance: Not applicable. This product is a calibrator, not an AI-powered diagnostic device, and therefore, no MRMC study or evaluation of human reader improvement with AI assistance was performed or is relevant.

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

Standalone Performance: Not applicable. This is not an algorithm, so "standalone performance" of an algorithm is irrelevant.

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

Ground Truth: For a calibrator, the "ground truth" would be the assigned concentration values for DHEA-S in each calibrator vial. These values are established by the manufacturer, traceable to primary reference materials, and validated through analytical methods. It's not based on expert consensus, pathology, or outcomes data in the diagnostic sense.

8. The sample size for the training set

Training Set Sample Size: Not applicable. This device is not an AI/ML algorithm that requires a "training set."

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

Training Set Ground Truth Establishment: Not applicable, as there is no "training set."

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