In simple terms, dual marker is to be done from 9-13 weeks (Ultrasonography detects the nuchal translucency- for the same gestational period)
Quadruple is to be done from 14-18 weeks
Both detect the chance of trisomy 21 ( Down's syndrome).
Elderly females or those who had a previous pregnancy with issues should definitely do it, but certainly not by everyone.
Answered2019-11-18 13:39:07
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