What is the first trimester screening test?

The first trimester screening test is best done between 12 and 13 weeks gestation and involves an early ultrasound that looks at the nuchal translucency which is a fluid collection at the back of the fetal neck as well as a maternal blood test for two hormones PAPP-A and BHCG. Several large studies have shown that the first trimester screening test along with maternal age is a very effective screening test for Down’s Syndrome. It offers information soon and for women found to be at an increased risk, she can be offered genetic counseling, CVS, or second trimester amniocentesis.