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Pregnancy is typically divided into three trimesters.
) the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage (90 to 110 beats per minute under 6 to 7 weeks, then 110 to 200 beats per minute as the baby matures).However, it can also be useful for adults who aren’t pregnant.The yolk sac, GI tract, and liver of an unborn baby produce AFP.It is most accurate between the 16th and 18th weeks, so it’s important to know exactly when you became pregnant. This screening exam also tests your levels of: Doctors will use your quad screen results, your age, and your ethnicity to help determine the chances that your unborn baby has a genetic birth defect.Defects detected by this type of screening can include neural tube defects, such as spina bifida, and chromosomal abnormalities, such as Down syndrome.
An alpha-fetoprotein (AFP) test is a blood test that measures the amount of AFP present in blood.