What Blood Tests Are Done At 12 Weeks Pregnant?

What Blood Tests Are Done At 12 Weeks Pregnant? First trimester screening is usually performed between 11 and 14 weeks of pregnancy and includes the measurement of blood levels of pregnancy associated plasma protein A (PAPP-A) and either free or total human chorionic gonadotrophin (hCG). In addition, an ultrasound scan called nuchal translucency is done.