Screening for DS, : offered to all pregnant women, is done after 10 weeks' gestational age, usually at 11-13 weeks. Both the 1st trimester comprehensive screen & the 1st & 2nd trimester integrated screen use fetal ultrasounds, blood tests for specific proteins & hormones & maternal age at delivery to calculate risk of DS. (If 36, risk us 1:294; if 37, 1:227). Diagnostic tests are offered if calculated risk is high.
Answered 1/5/2015
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