Most fetuses are nestled inside the uterus (womb), curled up tight. This cozy position, knees to chest, is known as the fetal position. During pregnancy, the fetal position also refers to the ...

[1] Because of the risk of fetal loss, amniocentesis was only offered to women in whom the risk for aneuploidy, or chromosome abnormality, was significantly high--that generally meant pregnant ...

Background: The most common chromosomal abnormalities are aneuploidies of chromosome 21, 18, 13, X and Y. Prenatal diagnosis of fetal aneuploidies is routinely done by traditional cytogenetic ...

Second-trimester screening of a pregnant woman's serum for markers of such congenital abnormalities as fetal trisomy 21 (Down syndrome) and neural tube defects has become an important part of ...