Get Virtual Care
For Businesses
About Us
A member asked:
Lmp was 16th apr but dating scan at 9 weeks says it was 22nd apr. does this mean i ovulated late. anatomy scan at 20 weeks said lmp was 19th apr?
A doctor has provided 1 answer
No: Your LMP differs from the 9 week scan by 6 days and the 20 week scan by 3 days. It is consistent. It does not mean you ovulated late or early. There is a built in margin of error in ultrasound and LMP dating. They are all within that margin so your due date should be calculated by your LMP. It is only changed if the ultrasound is greater that 7 days in the 1st trimester and 14 days in the 2nd.
Answered 10/18/2015
2.1k views
Thank
Related Questions
A member asked:
If your early dating ultrasound shows that my conception date is 18 days after my lmp, does that mean i ovulate late?
A doctor has provided 1 answer
A member asked:
Why did dating scan change lmp by 7 days. Which should i go by? I want to find when i ovulated to find paternity.
A doctor has provided 1 answer
A member asked:
Does everyone ovulate on day 14? Is this why my dating scan changed my lmp 7 days later than it was? Because i didnt ovulate on day 14??
5 doctors weighed in across 2 answers
A member asked:
Do first trimester dating scans change lmp to match ovulation day and make cycle 28 days?
A doctor has provided 1 answer
A member asked:
If my early dating u/s confirms my LMP dates, what can that tell me about when i most likely ovulated? Anything at all?
2 doctors weighed in across 2 answers
People also searched for:
Lmp was 16 apr so does that mean i ovulated on the 30 apr. or should i go by lmp dating scan at 9wks saying my lmp was 22nd apr making ovulation 6 may?
Lmp was 16th april does this mean i definitely ovulated on the 30th april. or should i go by dating scan saying lmp 22nd may & ovulation 6th may.
Why did my 9 week scan change my lmp date? Did i ovulate late. Is that what happend? Is dating scan at 9 weeks accurate to find ovulation?
Should i go by lmp or dating scan at 9 weeks? Dating scan changed lmp date to 6 days later than it actually was. Is this because i ovulated late?
Does dating scan lmp go by 28 day cycle. What if i ovulated late?
Didn't find what you're looking for?
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your questionMore of what we treat
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.
HIPAASecure
SOC 2 Type 2Certified
JCAHOAccredited
Download HealthTap
Video visit and message your doctor
