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

Early ultrasounds always accurate? how inaccurate can they be?

3 doctors weighed in across 2 answers
Dr. Robert Killian answered

Specializes in General Practice

OB Ultrasounds: The early ultrasounds are the most accurate. They should not be considered inaccurate in any way.

Answered 8/27/2013

4.9k views

Thank

Ultrasound dating: First trimester ultrasound is accurate within 5-7 days. There is no test that can date conception more accurately than a 1 week window.

Dr Ali agreed

Answered 12/9/2013

4.9k views

Thank

Related Questions

A member asked:

How accurate is an ultrasound at 5 weeks 4 days? I was able to see a heartbeat that early. What is the earliest this can be detected?

A doctor has provided 1 answer

A member asked:

I had a ultrasound at 12weeks my conceive date was may6th and one at 25weeks conceive date may15 which one is more accurate early or later?

A doctor has provided 1 answer

A member asked:

My DueDate is on 11.20.15. I had 4 early ultrasounds that gave me EDD nov 23, 20, 19. When would I have conceived? & how accurate are ultrasounds?

A doctor has provided 1 answer

A member asked:

How accurate is an early ultrasound? On 6/15/18 baby measured 5w6d. Between what dates could conception of happened? LMP 5/5.

A doctor has provided 1 answer

A member asked:

Is an efw via ultrasound of 3lb 9-10oz large for a 30w3d fetus? How accurate is this weight? Edd was confirmed by multiple early ultrasounds.

2 doctors weighed in across 2 answers

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:

How accurate are 6 week ultrasounds and why do some babies come 2 weeks early if ultrasounds are accurate?
How accurate are early ultrasounds? I had my first ultrasound at 6 weeks and all my other ones have been consistent.
Could very early ultrasound (5 weeks) be not accurate? it showed only 4 weeks, what doesn't match my ovultation. At 12 week it was correct...
When it is said that early (8 wk) ultrasounds are accurate +/- 2 days, what exactly does that mean? It is 1 to 2 days accurate of the conception day?
Is LMP more accurate than early ultrasound?

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.