HealthTap Online Primary Care Doctors Accepting New Patients
Book a video visit
HealthTap
Telehealth
A member asked:

Can a first trimester ultrasound gestational age/edd be wrong by 7 weeks?

A doctor has provided 1 answer
Dr. Parul Krishnamurthy answered

Specializes in Obstetrics & Gynecology

No: First trimester ultrasounds are the most accurate for estimating gestational age within +/- 7 days.

Dr Holzman agreed

Answered 11/27/2012

5.5k views

Thank

Related Questions

A member asked:

How accurate are 1st trimester ultrasounds in estimating gestational age? What about 2nd trimester ultrasounds?

A doctor has provided 1 answer

A member asked:

What are the possible dates i concived with a due date of june 21st and I am now measuring a week ahead. Can first trimester ultrasounds be 2 weeksoff?

A doctor has provided 1 answer

A member asked:

I ovulated on octomber 4th(that was CD13). According to this due date is 06/27.first trimester ultrasound(week 8) said DD is 06/23.which is reliable?

A doctor has provided 1 answer

A member asked:

Can a 7-8 week vaginal ultrasound be a month off with dating the gestational age/due date?

A doctor has provided 1 answer

A member asked:

Do ultrasound measure from gestation age or fetal age? Im 23w 5d from my lmp 6/8/22 ultrasound also adds up to my last period. My due date is 3/21/23?

A doctor has provided 1 answer

Sponsored Content
HealthTap Medical Group does not endorse products or services. Sponsored content revenues support our mission to make health information free and accessible to all.Learn more

People also searched for:

Would the gestational age of 12wks+4days @62mm be off by 1 week since ultrasounds have a margin of error of 1 week in the first trimester?
Is u/s dating in first trimester more accurate that going by LMP? EDD changed & going by ultrasound now...
What changes a due date? And why is the first trimester ultrasound more accurate than the second trimester ultrasound?
LMP was Feb 18, I have shorter cycles of 25/26 days. 3 first trimester ultrasounds gave me a due date of Nov 19-21 putting conception at Feb 27-29. How accurate are these conception dates? Anyway conception occurred before February 20?
My first ultrasound was in my late 2nd trimester. How accurate is due date?

Telemedicine

Primary Care
Manage Your Conditions
Women's Health
Children's Health
Men's Health
Senior Health
Wellness, Prevention & Lifestyle
Sexual Health
Mental & Behavioral Health
Travel Medicine
Urgent Care
Ask your question
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 question

More of what we treat

Allergies
Antibiotics
Asthma
High Blood Pressure
Prescriptions
Type 2 Diabetes
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.
HealthTap
HIPAA logo
HIPAASecure
Soc 2 Type 2 logo
SOC 2 Type 2Certified
JCAHO Accredited
JCAHOAccredited
Member App

Download HealthTap

Video visit and message your doctor

Member App QR Code
Play Store Member LinkApp Store Member Link

Questions?

+1 (888) 828-0841support@healthtap.com
LinkedInTwitter
HomeTermsPrivacyCookiesDMCAHealth TopicsDoctors DirectoryDoctor Q&A by Specialty
Copyright 2026 HealthTap, Inc.