1. 
   Quad Screen
   A protein produced by a developing fetus that is present in amniotic fluid and in the mother's blood. The early blood test is called the triple screen and should be performed between the 15th and 18th week of pregnancy. Abnormal levels of AFP can indicate abnormalities in the fetus. Elevated levels ...
   Found op http://www.pregnology.com/AZ/Q/1
   
   

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