A member asked:

The test for trisomy 21 was okay in week 12 and bad at week 16. why?

A doctor has provided 1 answer
Dr. Johanna Fricke answered

Specializes in Pediatrics - Developmental and Behavioral

Integrated screening: tests for Down Syndrome & other disorders include 1st trimester Fetal UltraSound & maternal blood test for specific pregnancy-related proteins & a 2nd-trimester blood test for 4 pregnancy-related substances, the levels of which are interpreted for gestational age. Your OB may get another FUS & blood test, cell-free fetal DNA, so you can decide if you want a diagnostic test of fetal chromosomes.

Answered 9/8/2016

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