An AFP blood test is used to check a developing foetus for birth defects and genetic disorders, like neural tube defects or Down syndrome.
Alpha-fetoprotein (AFP) is a protein produced in the liver of a developing foetus. During a baby’s development, some AFP passes through the placenta and into the mother’s blood.
An AFP test measures the level of AFP in pregnant women during the second trimester of pregnancy. Too much or too little AFP in a mother’s blood may be a sign of a birth defect or other condition.