1st trimester screening
First-trimester screening (FTS) is a screening test in the context of prenatal diagnosis in the first third of pregnancy (the first trimester is the first 3 months of the 9-month pregnancy) to find a Down syndrome With the unborn child.
The first trimester screening is one of three non-invasive methods of Down syndrome detection and, according to a test of the Stiftung Warentest [1] from 2009, is third in terms of safety of the detection (that is, the highest possible detection rate and as few false positive findings as possible) ) Behind the Integrated Screening and Sequential Screening.
Source: Wikipedia