Alpha-fetoprotein or AFP:
Alpha-fetoprotein is the name of a protein that is produced by the fetus’ liver. Conducting a blood test on the mother between her 16th and 18th week of pregnancy can help determine the level of alpha-fetoprotein. If the levels of AFP are higher than normal, it can be associated with spina bifida, a neural-tube birth defect. Lower levels of AFP could result in Down’s syndrome. 
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