| http://www.w3.org/ns/prov#value | - n) or four (in a quad screen) hormones and proteins in your blood, including AFP, hCG, estriol, and inhibin A. The results are plugged into a formula that also factors in your age, weight, race, and other issues; when taken all together, these figures can provide an idea of how likely it is that your baby could be born with one of several birth defects.
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