Amniocentesis

Explanation

Amniocentesis is a diagnostic procedure that removes a small sample of the fluid surrounding a fetus for specific laboratory tests.

What happens during amniocentesis?

Ultrasound shows the position of the fetus and placenta. A clinician guides a thin needle through the abdomen and removes a small amount of amniotic fluid. The fluid contains fetal cells and other substances that can be tested in a laboratory.

Is amniocentesis a screening test?

No. Prenatal screening estimates the chance that a condition may be present. Amniocentesis is used to diagnose certain conditions by analysing the collected fluid. Chorionic villus sampling, or CVS, is another diagnostic procedure, but it samples placental tissue instead of amniotic fluid.

What do the results cover?

The result only addresses the conditions included in the ordered analyses. A negative result does not guarantee that the fetus has no health problems. Results may need explanation from the care team or a genetic counsellor.

What are the risks?

Amniocentesis is an invasive procedure. Temporary cramping, discomfort, bleeding, or fluid leakage can occur, and there is a small risk of serious complications including miscarriage. The personal benefits and risks should be discussed before deciding whether to have it.

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