What Does the First Trimester Screening Test For? Topic Guide

What Does the First Trimester Screening Test For? What Does the First Trimester Screening Test For?: Between the 11th and 13th week of pregnancy, a woman will have an ultrasound and blood screening test to estimate the probability a genetic disorder and identify risks for specific chromosomal abnormalities, including Down Syndrome (trisomy-21), trisomy-18, and trisomy 13. The first trimester screening test is not a diagnostic test and does not provide a definitive diagnosis.

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