Mamalina

The first trimester screen, done around 11 to 14 weeks, combines nuchal translucency and blood markers to estimate risk for certain chromosomal conditions. It is not diagnostic; high risk leads to further testing.

The glucose tolerance test, usually done around 24 to 28 weeks, checks for gestational diabetes. Untreated gestational diabetes can increase risks such as a large baby, excess amniotic fluid, and difficult birth.