Amniotic  fluid chromosomal analysis is a diagnostic test    performed   during   pregnancy   to   evaluate   the fetus's genetic health. It  involves   collecting  a sample of amniotic fluid, which surrounds the fetus, through a procedure called amniocentesis. The fluid contains   fetal   cells,     which  are    then  cultured   and analyzed for chromosomal abnormalities. This test      can     detect      conditions      like       Down  syndrome, trisomy 18, and other  genetic  disorders with    high        accuracy.      Unlike           screening  tests, amniocentesis provides definitive results. The procedure is typically done   between   15   and    20 weeks of pregnancy. Although it carries a  small risk of miscarriage, it offers valuable    information     for parents and healthcare providers.