LA
A 25-year-old female asked:
How can conception date determined by early trans u/s done at 6 weeks 3days be accurate if you can still get pregnant w/in the 2 weeks of gestational age?
1 doctor answer • 1 doctor weighed in
Dr. Robert Crumbanswered
Obstetrics and Gynecology 27 years experience
The size counts: 6 weeks is a historic term based on first day of last menses, with conception on the first day of week 2. Ultrasound measures size. Every pregnancy starts as a single cell. The closer to that point the image, the more accurate the estimate. At 6 wks 3 days the accuracy is about +/- 5 days. So if that is the ultrasound size the conception was 4 wks 3 days +/- 5 days prior.
Created for people with ongoing healthcare needs but benefits everyone.
5.4k viewsAnswered >2 years ago
Last updated Sep 1, 2013
People also asked
Connect with a U.S. board-certified doctor by text or video anytime, anywhere.
24/7 visits - just $44!
50% off with $15/month membership
Disclaimer:
Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.