What is the fetal serum albumin test? The fetal serum albumin test measures the amount of albumin in your baby's blood. Albumin is a vital protein produced by the fetal liver that helps maintain proper fluid balance, carries nutrients, hormones, and medications throughout the body, and protects developing tissues. This test is typically performed during high-risk pregnancies or when your doctor has concerns about your baby's growth, development, or liver function. How is the test performed? A small blood sample is obtained from the fetus using one of two procedures: amniocentesis, in which a small amount of amniotic fluid containing fetal cells is withdrawn, or cordocentesis (percutaneous umbilical blood sampling), in which blood is taken directly from the umbilical cord. A maternal-fetal medicine specialist performs these procedures under ultrasound guidance, and the sample is then sent to a laboratory for analysis. What do the results mean? Normal albumin levels vary depending on gestational age. Low levels in the fetus may point to poor fetal growth, placental insufficiency, liver dysfunction, or nutritional deficiencies, and very low levels can lead to fetal hydrops, an abnormal buildup of fluid. High levels are less common but may be associated with certain conditions. Your healthcare provider will interpret your results based on gestational age, your overall clinical situation, and findings from other tests. Why is albumin important for the fetus? Albumin helps your baby maintain proper blood pressure, delivers nutrients and hormones to developing tissues, and supports healthy growth and development. Low albumin can lead to complications such as fetal growth restriction and hydrops. Is this test safe for my baby? The procedures used to obtain fetal blood carry a small risk of complications, including miscarriage, infection, or bleeding. These risks are generally low when an experienced specialist performs the procedure. Your healthcare team will review the risks and benefits with you before the test. How long does it take to get results? Results usually arrive within 2-7 days, depending on the laboratory. The analysis requires specialized testing and may be performed at reference laboratories with specific expertise in fetal testing. Will I need other tests along with this one? Yes, fetal albumin testing is often part of a broader evaluation that may include additional blood tests, ultrasound examinations, and close monitoring. This comprehensive approach gives your care team a complete picture of your baby's health.

A blood test that measures albumin levels in your unborn baby's blood to evaluate fetal health, liver function, growth, and overall development during pregnancy, usually ordered when doctors need detailed information about how well your baby is developing.