The triple marker test is a follow-up test performed in the second trimester of pregnancy after the double marker blood test to assess the risk of certain genetic disorders in the fetus by measuring the levels of three substances in the mother's blood: alpha-fetoprotein (AFP), estriol, and human chorionic gonadotropin (hCG).
The triple marker test is typically included as part of the triple screen test, which combines the blood test with an ultrasound examination. This comprehensive approach increases the accuracy of the results, which can further provide valuable insights into the fetus’s health.