Quad screen is a blood test taken between weeks fifteen to eighteen checking complacations and fetus status.

The test inspects four substances: AFP (protein produced by the fetus), hCG: human chorionic gonadotropin Estriol, estrogen produced by the fetus and the placenta and Inhibin-A, which is a protein produced by the placenta and ovaries.

The test shows if the fetus is in risk or problematic, mostly it warns for down syndrome.  This test does not identify a specific problem; it only determines if more tests need to be done.

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