0 a rare and very serious genetic condition in which there is an additional copy of chromosome 18 in some or all of the body's cells:
Other chromosomal abnormalities include trisomy 18 (Edwards' syndrome) and trisomy 13 (Patau syndrome).
Mean survival time (MST) for trisomy 18 is 14.5 days, and MST for trisomy 13 is 7 days.
One recent case involved a fetus diagnosed with Trisomy 18, a deadly chromosomal abnormality.
Amniocentesis is a test that detects most chromosomal disorders such as Down's syndrome, trisomy 18 and spina bifida by inserting a needle through the abdomen to remove fluid from the uterus.
