Acheamnql

What is this test?

The acetylcholinesterase test is a specialized laboratory test performed on amniotic fluid, which is the clear liquid that surrounds the developing baby (fetus) in the womb. Acetylcholinesterase is an enzyme normally found in the baby's central nervous system. Its presence in amniotic fluid can indicate certain developmental abnormalities.

How is the test performed?

The test requires a sample of amniotic fluid, which is collected 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 sample is then sent to a laboratory for analysis to detect the presence or absence of acetylcholinesterase.

Why is this test done?

This test is primarily used to help detect neural tube defects (NTDs) in the developing fetus. Neural tube defects are serious birth defects that occur when the neural tube (which eventually becomes the brain and spinal cord) does not close completely during early pregnancy. Examples include spina bifida (open spine) and anencephaly (absence of a major portion of the brain).

When is this test typically ordered?

Healthcare providers may recommend this test when: 1) A maternal serum alpha-fetoprotein (AFP) screening test shows elevated levels, which can suggest a neural tube defect; 2) Ultrasound imaging suggests potential abnormalities; 3) There is a family history of neural tube defects; or 4) As a follow-up to confirm findings from other screening tests.