Quad Screen Test, A Multiplexed Biomarker Assay for Prenatal Screening to Assess Birth Defects: The Columbia University Experience Using the Beckman Access2 Immunoassay Analyzer and Benetech PRA.

In the prenatal quad screen, the levels of four analytes in maternal serum are used to calculate the risk of serious birth defects. The Beckman Access2 Immunoassay System is an automated analyzer that enables rapid measurement of alpha-fetoprotein, unconjugated estriol, human chorionic gonadotropin, and dimeric inhibin A. The Benetech PRA software package is used to convert maternal serum analyte concentrations to multiples of the median (MoM) and calculates the risks of particular birth defects. The results from this simple and minimally invasive screen determine the need for more sensitive, specific, and usually riskier diagnostic procedures. We present herein some recent data from our experience at Columbia University Medical Center in New York, NY, using the Beckman Access2 immunoassay analyzer and Benetech PRA software package.