Pregnancy dating: Not clear when you got pregnant, you could have missed a period without being pregnant. Follow up with your OB and they will do another US later in pregnancy, that will confirm the age of the pregnancy.
Answered 2/13/2016
1.6k views
Crown rump length: Fetal crown-rump-length determined by transvaginal ultrasound is very reliable in determining the gestational age. Gestational age determined by TVS trumps gestational age by last menstrual period.
Answered 2/14/2016
1.6k views
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