“Maternal serum screening (MSS) is an optional test usually offered between weeks 15 and 22 of your pregnancy. This test is available from Mayo Clinic Laboratories as Mayo ID: QUAD1 / Quad Screen (Second Trimester) Maternal Serum. It provides information on your risk of having a child with Down syndrome or a neural tube defect. A risk for trisomy 18 (a rare and usually fatal condition) is also provided in cases where the risk is high. The screening does not provide a yes-or-no answer about the presence or absence of these conditions. Rather, the screening identifies pregnancies that may be in a higher risk group and, in turn, can serve as a guide to choosing further testing to confirm or rule out these conditions. The following are descriptions of the conditions.” Read More
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