REAADS VON WILLEBRAND FACTOR ANTIGEN TEST KIT by REAADS MEDICAL PRODUCTS, INC.

The REAADS von Willebrand Factor Antigen (vWF:Ag) Test kit is an in vitro diagnostic assay for the quantitative determination of human plasma levels of vWF:Ag (as a percent assay to throncentration) by enzyme linked immunosorbent assay (ELISA). Plasma levels of vWF:Ag may be used as an aid in diagnosing von Willebrand disease.

Device Description

The REAADS von Willebrand Factor Antigen Test Kit is a sandwich enzyme linked immunosorbent assay (ELISA). The capture antibody specific for human vWF is immobilized to 96-microwell polystyrene plates. Diluted patient plasma is incubated in the wells, allowing any available vWF:Ag to bind to the anti-human vWF antibody bound to the plastic. The plates are rinsed to remove any unbound plasma vWF:Ag molecules. Bound vWF:Ag is quantitated using an HRP conjugated anti-human vWF detection antibody. Any unbound conjugated anti-human vWF is washed away after an incubation period. A chromogenic substrate of tetramethylbenzidine (TMB) and hydrogen peroxide (H2O2) is added to develop a colored reaction. The intensity of the color is measured spectrophotometrically at 450nm in optical density (O.D.) units. vWF:Ag relative percent concentrations of patient plasma is determined against a curve made from a reference plasma provided.

AI/ML Overview

Here's an analysis of the provided text regarding the REAADS von Willebrand Factor Antigen Test Kit, extracting the requested information:

Acceptance Criteria and Study Details for REAADS von Willebrand Factor Antigen Test Kit

1. Table of Acceptance Criteria and Reported Device Performance

Acceptance Criteria (Implied)	Reported Device Performance
Substantial Equivalence:
Coefficient of Correlation	0.962
P-value (Single factor ANOVA)	0.739

Note: The document states that the REAADS vWF:Ag Test Kit is compared to a legally marketed predicate device (Helena Von Willebrand Factor Antigen Rocket EIA) and a substantial equivalence claim is made. The acceptance criteria are implied by the statistical results presented to demonstrate this equivalence. Specifically, a high coefficient of correlation and a non-significant P-value (>.05) typically demonstrate statistical similarity and thus medical equivalence.

2. Sample Size for the Test Set and Data Provenance

The document refers to "Test results for clinical samples" but does not specify the exact sample size used for the test set.

The data provenance is also not explicitly stated in terms of country of origin or whether it was retrospective or prospective. It only mentions "clinical samples."

3. Number of Experts and their Qualifications for Ground Truth

The document does not mention the use of experts to establish ground truth for the test set. The comparison is made against a predicate device.

4. Adjudication Method for the Test Set

Not applicable/Not mentioned. Since a comparison was made against a predicate device's results directly, and not against an expert-adjudicated ground truth, no adjudication method is described.

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

No MRMC comparative effectiveness study was mentioned. This device is an in-vitro diagnostic test, not typically evaluated with MRMC studies involving human readers and AI assistance.

6. Standalone Performance Study

A standalone performance study was implicitly done by comparing the REAADS vWF:Ag Test Kit to the predicate device. The comparison directly evaluates the algorithm's (test kit's) performance against another established method.

7. Type of Ground Truth Used

The ground truth for the test set was essentially the results obtained from the legally marketed predicate device, the Helena Von Willebrand Factor Antigen Rocket EIA.

8. Sample Size for the Training Set

Not applicable/Not mentioned. This is a traditional ELISA-based test kit and does not involve AI or machine learning models that typically have "training sets." The development of such kits involves assay optimization and validation, not model training.

9. How the Ground Truth for the Training Set was Established

Not applicable/Not mentioned. As this is not an AI/ML device, the concept of a "training set" and establishing ground truth for it does not apply. The development would involve analytical validation and calibration using known concentrations of vWF:Ag.

Summary

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SUMMARY OF 510(K) SAFETY AND EFFECTIVENESS

REAADS von Willebrand Factor Antigen Test Kit

July 30, 1997

AUG 1 3 1997

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.

The REAADS von Willebrand Factor Antigen (vWF:Ag) Test Kit is compared to a legally marketed predicate device and a substantial equivalence claim is made. The predicate device is the Helena Von Willebrand Factor Antigen Rocket EIA (former name: Helena Factor VIII-Related Antigen Rocket EID System) currently manufactured and marketed by Helena Laboratories, Beaumont, Texas.

The intended use of the device is to quantitatively determine vWF:Ag in citrated human plasma. Normal levels of vWF:Ag are generally accepted to be between 50-160% as compared to a standard or pooled normal plasma. Patients suffereing from von Willebrand Disease can have either quantitative levels or decreased function of vWF between 0 - 50% as compared to a standard or pooled normal plasma. The quantitative results from REAADS vWF ELISA may be used in conjunction with functional assay determinations to establish a diagnosis of vWF.

Test results for clinical samples demonstrate that the performance of the REAADS vWF:Ag Test Kit and the Helena Von Willebrand Factor Antigen Rocket EIA Method is substantially equivalent. The coefficient of correlation for the entire population is 0.962, with a P-value of 0.739 (by single factor ANOVA), indicating the results by the two methods are statistically similar. Although a few minor differences in value recovery were observed between the assays, in general the performance was comparable. The differences may be attributed to the improved specificity of REAADS ELISA technology when compared to EIA.

Maria Dette

2-30-97
Date

Nanci Dexter Director, Quality and Regulatory Affairs

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Food and Drug Administration 2098 Gaither Road Rockville MD 20850

AUG 1 3 1997 Ms. Nanci Dexter Director Quality and Regulatory Affairs REAADS Medical Products, Inc. 12061 Tejon Street Westminster, CO 80234

Re : K972005/S1 REAADS® von Willebrand Factor Antigen Test Kit Regulatory Class: II Product Code: GGP Dated: July 30, 1997 Received: August 1, 1997

Dear Ms. Dexter:

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, Druq, 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 requlations affecting your device can be found in the Code of Federal Requlations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the current Good Manufacturing Practice requirement, as sec forth in the Quality System Regulation (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 requlation (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 note the 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 for Use Statement

510(k) Number: _

Device Name: REAADS von Willebrand Factor Antigen Test Kit

Indications for Use: ... ...........................................

The REAADS vWF:Ag Test Kit is intended to be used by clinical (hospital and reference) laboratories.

(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED) Concurrence of CDRH, Office of Device Evaluation (ODE)

Divisio (Din-Off)
Division of Clinical Laboratory Devices
510(k) Number K72285

prescription
use 8/12/97
CA

Regulation Number and Section

§ 864.7290 Factor deficiency test.

(a)
Identification. A factor deficiency test is a device used to diagnose specific coagulation defects, to monitor certain types of therapy, to detect coagulation inhibitors, and to detect a carrier state (a person carrying both a recessive gene for a coagulation factor deficiency such as hemophilia and the corresponding normal gene).(b)
Classification. Class II (performance standards).