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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.