The maternal screening tests that are considered to be part of the "quadruple test" for estimating Down syndrome risk include:

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The quadruple test includes four markers: alpha-fetoprotein, unconjugated estriol, chorionic gonadotropin, and inhibin A. These markers are used to estimate the risk for Down syndrome in a fetus. Option A includes bilirubin and alpha₁-antitrypsin, which are not part of the quadruple test. Option B includes inhibin B, which is not a part of the quadruple test. Option C includes amniotic bilirubin, which is not a part of the quadruple test.

The Maternal Screening Tests That Are Considered to Be Part