The VALP method for the Dimension® clinical chemistry system is a device used to quantitatively measure valproic acid, an anti-convulsant drug, in serum or plasma. VALP test results may be used in the diagnosis and treatment of valproic acid overdose and in monitoring levels of valproic acid to ensure appropriate therapy.

Device Description

The VALP method for the Dimension® clinical chemistry system is a particle enhanced turbidimetric inhibition immunoassay which uses a latex particle-valproic acid conjugate and valproic-acid specific monoclonal antibody (Ab). Valproic acid present in the sample competes with the particles for the antibody, thereby decreasing the rate of aggregation. The rate of aggregation is inversely proportional to the concentration of valproic acid in the sample. The rate of aggregation is measured using bichromatic turbidimetric readings at 340nm and 700nm

AI/ML Overview

Acceptance Criteria and Reported Device Performance:

Acceptance Criteria	Reported Device Performance (Comparison to Predicate)
Correlation Coefficient	0.995
Slope	1.10
Intercept	-2.82 µg/mL

The study demonstrates that the Dade Behring Valproic Acid Method has a very strong correlation (0.995) and a slope close to 1 (1.10) when compared to the Abbott AxSYM® Valproic Acid Assay, indicating substantial equivalence.

Sample Size Used for the Test Set and Data Provenance:
- Sample Size: 158 clinical patient samples.
- Data Provenance: The document does not specify the country of origin. The data is retrospective, as it involves a "split sample comparison" with existing clinical patient samples.
Number of Experts Used to Establish Ground Truth for the Test Set and Qualifications:
- This information is not provided in the document. The ground truth for the test set is established by the results from the predicate device (Abbott AxSYM® Valproic Acid Assay), not by expert review.
Adjudication Method for the Test Set:
- An adjudication method is not applicable here as the ground truth is established by the predicate device's results, not by expert consensus requiring adjudication.
Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study:
- No, an MRMC comparative effectiveness study was not conducted as this is a comparison for an in-vitro diagnostic device, not an imaging or interpretive device that would typically involve human readers.
Standalone (Algorithm Only) Performance:
- Yes, a standalone performance was done. The study directly compares the results of the new Dade Behring Valproic Acid Method (an algorithm/assay) against the predicate device. The performance metrics (correlation, slope, intercept) are for the device itself, without human-in-the-loop assistance.
The Type of Ground Truth Used:
- The ground truth used for the test set was the results obtained from the Abbott AxSYM® Valproic Acid Assay, which served as the predicate device. This is a form of comparative ground truth against a legally marketed and established method.
Sample Size for the Training Set:
- The document does not explicitly mention a separate "training set" or its sample size. The 158 clinical patient samples are used for the comparison study, which assesses the device's performance against the predicate. In the context of an immunoassay, the "training" (calibration) would typically involve a set of known standards rather than a clinical patient dataset for algorithm development in the way a machine learning model might.
How the Ground Truth for the Training Set Was Established:
- Given that a specific "training set" of clinical samples with established ground truth a la machine learning is not described, this question is not directly applicable. For new in-vitro diagnostic assays, the device's calibration curve (which is analogous to 'training' the assay to accurately measure concentrations) is typically established using a series of known valproic acid calibrators with assigned concentrations, rather than a dataset of patient samples with independent ground truth established by experts.

Summary

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DADE BEHRING INC. P.O. Box 6101 Newark, DE 19714

DADE BEHRING K98280

Summary of Safety and Effectiveness Information

This summary of 510(k) safety and effectiveness information is being submitted in accordance with the requirements of SMDA 1990 and 21 CFR 807.92.

Submitter's Name:	Rebecca S. AyashDade Behring Inc.Building 500, Mailbox 514P.O. Box 6101Newark, DE 19714-6101
Date of Preparation:	8/13/98
Device Name:	Valproic Acid Method
Classification Name:	Enzyme Immunoassay, Valproic Acid
Predicate Device:	Abbott AxSYM® Valproic Acid Assay

Device Description: The VALP method for the Dimension® clinical chemistry system is a particle enhanced turbidimetric inhibition immunoassay which uses a latex particle-valproic acid conjugate and valproic-acid specific monoclonal antibody (Ab). Valproic acid present in the sample competes with the particles for the antibody, thereby decreasing the rate of aggregation. The rate of aggregation is inversely proportional to the concentration of valproic acid in the sample. The rate of aggregation is measured using bichromatic turbidimetric readings at 340nm and 700nm

Valproic acid + PR + Ab ------------------------------------------------------------------------------------------------------------------------------------------------------(scatters light at 340nm)

Intended Use: The VALP method for the Dimension® clinical chemistry system is a device used to quantitatively measure valproic acid, an anti-convulsant drug, in serum or plasma. VALP test results may be used in the diagnosis and treatment of valproic acid overdose and in monitoring levels of valproic acid to ensure appropriate therapy.

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Comparison to Predicate Device:

Item	Dimension® VALPMethod	Abbott AxSYM® ValproicAcid
Technology	Particle EnhancedTurbidimetric InhibitionImmunoassay	FluorescencePolarizationImmunoassay
Detection	Rate turbidimetricabsorption	Fluorometric endpointmeasurement
Sample Size	3μL	150μL
Sample Type	Serum or plasma	serum or plasma
Intended Use	For the quantitativemeasurement of valproicacid	For the quantitativemeasurement of valproicacid

Comments on Substantial

Equivalence: Split sample comparison between the VALP method for the Dimension® system and the Abbott AxSYM® Valproic Acid assay gave a correlation coefficient of 0.995, slope of 1.10, and an intercept of -2.82 µg/mL when tested with 158 clinical patient samples ranging from 11 - 147.7 ug/mL.

Conclusion: The VALP Method for the Dimension® clinical chemistry system is substantially equivalent in principle and performance to the Abbott AxSYM® Valproic Acid Assay based on the split sample comparison summarized above.

Rebecca S. Ayash

Rebecca S. Ayash Regulatory Affairs and Compliance Manager Date: 8/13/98

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Image /page/2/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a circular seal with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" arranged around the perimeter. Inside the circle is a stylized image of three human profiles facing right, with flowing lines representing hair or clothing.

Food and Drug Administration 2098 Gaither Road Rockville MD 20850

AUG 25 1998

Rebecca S. Ayash Regulatory Affairs and Compliance Manger Dade Behring, Inc. Building 500, Mailbox 514 P.O. Box 6101 Newark, Delaware 19714-6101

Re : K982880 Valproic Acid Method Regulatory Class: II Product Code: LEG Dated: Auqust 13, 1998 Received: August 14, 1998

Dear Ms. Ayash:

We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to 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). You may, therefore, market the device, subject to the general controls provisions The general controls provisions of the Act 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 (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Requlations, Title 21, Parts 800 to 895. ਜੋ substantially equivalent determination assumes compliance with the Current Good Manufacturing Practice requirements, as set forth in the Quality System Requlation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic QS inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory In addition, FDA may publish further announcements action. concerning your device in the Federal Reqister. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.

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Under the Clinical Laboratory Improvement Amendments of 1988 (CLIA-88), this device may require a CLIA complexity categorization. To determine if it does, you should contact the Centers for Disease Control and Prevention (CDC) at (770) 488-7655.

This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.

If you desire specific advice for your device on our labeling regulation (21 CFR Part 801 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4588. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please notethe regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its internet address "http://www.fda.gov/cdrh/dsmamain.html" .

Sincerely yours,
Steven Gutman

Steven I. Gutman, M.D., M.B.A. Director Division of Clinical Laboratory Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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Indications Statement

Device Name: Valproic Acid (VALP) Method

Indications for Use: The VALP method for the Dimension® RxL clinical chemistry system is a device used to measure valproic acid, an anti-convulsant drug, in serum or plasma. VALP test results may be used in the diagnosis and treatment of valproic acid overdose and in monitoring levels of valproic acid to ensure appropriate therapy.

Rebecca S. Ayresk

Rebecca S. Ayash Regulatory Affairs and Compliance Manager Date: 8/13/98

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

Concurrence of CDRH, Office of Device Evaluation (ODE)

K982880
510(k) Number

Division Sign-Off Office of Device Evaluation

Prescription Use V (Per 21 CFR 801.109)

Over-The-Counter Use

Regulation Number and Section

§ 862.3645 Neuroleptic drugs radioreceptor assay test system.

(a)
Identification. A neuroleptic drugs radioceptor assay test system is a device intended to measure in serum or plasma the dopamine receptor blocking activity of neuroleptic drugs and their active metabolites. A neuroleptic drug has anti-psychotic action affecting principally psychomotor activity, is generally without hypnotic effects, and is a tranquilizer. Measurements obtained by this device are used to aid in determining whether a patient is taking the prescribed dosage level of such drugs.(b)
Classification. Class II.