Achepnlamn

What is this test?

The acetylcholinesterase (AChE) test is a specialized prenatal diagnostic test performed on amniotic fluid. Acetylcholinesterase is an enzyme produced by the developing fetal nervous system. When there are openings in the baby's neural tube (such as spina bifida or anencephaly), this enzyme can leak into the amniotic fluid, causing elevated levels that can be detected through testing.

Why is this test performed?

This test is primarily used to help diagnose neural tube defects (NTDs) during pregnancy. Neural tube defects occur very early in pregnancy, often before a woman knows she is pregnant. The test may be recommended when: there are abnormal findings on ultrasound, a previous pregnancy had a neural tube defect, the mother has certain risk factors, or as a follow-up to abnormal screening results.

How is the test performed?

The test requires collecting a sample of amniotic fluid through a procedure called amniocentesis. During amniocentesis, a thin needle is inserted through the abdomen into the uterus to withdraw a small amount of amniotic fluid. The fluid is then sent to a laboratory for analysis. This procedure is typically performed between 15-20 weeks of pregnancy and is guided by ultrasound to ensure safety.

What do the results mean?

A positive result (elevated AChE in amniotic fluid) suggests a higher likelihood of a neural tube defect, though it does not provide a definitive diagnosis. A negative or normal result indicates that no elevated enzyme was detected, though it cannot guarantee a completely normal pregnancy. Your healthcare provider will interpret results alongside ultrasound findings and other tests to determine the next steps.

What are the risks?

Amniocentesis carries a small but real risk of complications, including a slight increase in the risk of miscarriage (approximately 1 in 300-500 procedures), infection, leakage of amniotic fluid, cramping, or injury to the baby. The procedure is performed under sterile conditions with ultrasound guidance to minimize these risks. Discuss any concerns with your healthcare provider.