Double test in pregnancy, when should it be done?
The double test aims to assess the risk of chromosome abnormalities in infants. It's called the most accurate: Combined screening test for chromosomal abnormalities in the first trimester.
This test aims to identify a population of pregnant women with a high risk of having children with chromosomal abnormalities (Down Syndrome). These pregnant women will undergo a diagnostic test - biopsy of chorionic villi, or possibly amniocentesis.
Following the diagnostic test one will know for sure if the fetus has an abnormality of the searched chromosomes.
The screening test has 2 components
1 Determination of some parameters in the blood of the mother (Papp A and b hCG);
2 An ultrasound measurement (nuchal translucency).
The results are correlated with the maternal age and with the help of a software a risk for the chromosomal abnormalities of the fetus is calculated.
The results of the screening test can be:
The screening test is done in the first trimester and allows to detect some very early pregnancy problems when the parents can opt for abortion within the law and avoiding the medical complications related to interrupting the pregnancy at an old age (bleeding, etc.).
Previously the triple test was used, at 17 weeks, but it is not as accurate as the first trimester test and is now offered only to those who did not take the test in the first trimester.
Dr. Anca Panaitescu
Tags Pregnancy Questions Pregnancy Analyzes Double test for congenital malformations 1st trimester of pregnancy