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

Are ultrasounds pretty accurate with conception dates?

A doctor has provided 1 answer

Yes: Ultrasound dating is most accurate early in the pregnancy using the crown-rump length (crl) of the small fetus. The measurement can be done starting around 6 weeks. While crl can be used for dating until 12 weeks, it is most accurate during 6-8 weeks when the accepted error is only about 3 days from actual date.

Dr Ali and 2 doctors agreed

Answered 10/25/2019

5k views

Thank

Related Questions

A member asked:

How accurate are doctors in knowing the date of conception once a woman has had an ultrasound?

4 doctors weighed in across 2 answers

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:

According to my 8 and 12 week ultrasounds my conception date is january 5? How accurate is this and how many days can it be off ?

A doctor has provided 1 answer

A member asked:

Question for you. My 14 week ultrasound gave me a fur date of 4/21/16. This would put conception from about 7/26-8/3. how accurate is this ultrasound?

A doctor has provided 1 answer

A member asked:

If someone had early ultrasound at six weeks determined conception date to be december 6, 2012 is that date accurate and how many days can it be off?

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:

How accurate are transvaginal ultrasounds at predicting date of conception?
Which is more accurate at determining the date of conception? A 5 or 8 week ultrasound?
How accurate are ultrasounds in determining your conception date? How many days can it be off?
Can a ultrasound be accurate enough to go by for conception date?
How accurate is a 6 and 7 week ultrasound for giving an estimate date on conception?

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.