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What is the most accurate test for Down syndrome?

Amniocentesis is the most accurate test for detecting chromosome problems such as Down syndrome.
Currently, more women are electing the first trimester combined test, done in two steps during week 11 to 13 of pregnancy. The first trimester combined test includes: Ultrasound. The doctor uses ultrasound to measure a specific region on the back of a baby's neck. This is known as a nuchal translucency screening test. When abnormalities are present, more fluid than usual tends to collect in this tissue. Blood tests. Results of the ultrasound are paired with blood tests that measure levels of pregnancy-associated plasma protein-A (PAPP-A) and a hormone known as human chorionic gonadotropin (HCG). Abnormal levels of PAPP-A and HCG may indicate a problem with the baby.

Continue Learning about Down Syndrome

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.