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Gynaecology & Obstetrics
Aneuploidy, is the most common genetic abnormality, accounting for up to 50% of clinical miscarriages. All are true about aneuploidy, EXCEPT:
30-40% of trisomy 21, fetus die between 12 weeks and 40 weeks
50-60% of trisomy 18, fetus die between 12 weeks and 40 weeks
Occurrence of triploidy has no relation with the progression of mother's age
In previous pregnancy with trisomy 21 due to non disjunction, the risk in future pregnancy is .75% higher
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