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What is this test?

The Basophils/Leukocytes in Blood from Fetus test measures the number and percentage of basophils (a type of white blood cell) in a blood sample taken from the fetus. Basophils are part of the immune system and play a role in fighting infections and allergic reactions. This test helps doctors understand how the fetal immune system is developing and whether there are any abnormalities that may indicate health problems.

How is the sample collected?

Fetal blood sample collection is performed by specialized doctors using ultrasound guidance. The most common methods include cordocentesis (taking blood from the umbilical cord) or amniocentesis (taking amniotic fluid). These procedures carry some risks and are only performed when medically necessary, such as when the fetus is suspected to have an infection, blood disorder, or immune system problem.

What do the results mean?

Results show the count of basophils relative to total white blood cells. Abnormal levels may indicate various conditions. High basophil counts may suggest infections, allergic reactions, or certain blood disorders. Low counts are less common but may indicate severe infections or bone marrow problems. Your doctor will interpret these results alongside other tests and your pregnancy circumstances.

Are there any risks?

Since this test requires obtaining blood directly from the fetus, it carries potential risks including bleeding, infection, miscarriage (small risk), or injury to the fetus or placenta. These procedures are only recommended when the benefits of obtaining the information outweigh the risks. Your healthcare team will discuss all risks and alternatives with you before the procedure.