ABOG Maternal-Fetal Medicine
GeneticsEnglish
Exam overviewPractice session
A 31-year-old G2P1 presents at 20 weeks for anatomy ultrasound. She is 5'6", weighs 230 lbs (BMI 37). cfDNA at 12 weeks reported 'no call' due to low fetal fraction. Which factor most likely explains the failed cfDNA result?
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