Get Virtual Care
  • Primary Care
  • Urgent Care
  • FAQs
  • Support Center
For Businesses
  • Direct Primary Care for Organizations
  • For DMEs and Pharmacies
  • For Health Plans
  • For Providers
About Us
  • Who We Are
  • Why HealthTap
  • Our Standards
  • Contact
Log in
Book a video appointment
Book now
  • Get Virtual Care

    • Primary Care
    • Urgent Care
    • FAQs
    • Support Center
  • For Businesses

    • Direct Primary Care for Organizations
    • For DMEs and Pharmacies
    • For Health Plans
    • For Providers
  • About Us

    • Who We Are
    • Why HealthTap
    • Our Standards
    • Contact
Log in to HealthTap
HealthTap Online Primary Care Doctors Accepting New Patients
Book a video visit
HealthTap
Telehealth
A member asked:

How accurate are crown to rump length measurements on an 8 and 12 week ultrasound ?

A doctor has provided 1 answer
Dr. Justin Buchanan answered

Specializes in Radiology

Good: Ultrasound crown-rump length measurements have an accuracy of +/- 4 days during the 1st trimester between weeks 6-13.

Dr Minich and 2 doctors agreed

Answered 10/15/2016

4.2k views

Thank

Related Questions

A member asked:

I av multiple follicles found in both ovaries during ultrasound. plus I don't have regular periods.. it's sometimes gaps for one year 5 months n sometimes 2-3 months.. and in the buttock part it's like rashes or ringworm that always reappear.?

A doctor has provided 1 answer

A member asked:

Is a ultrasound measurement of a fetal foot an accurate predictor of gestational age? What is the length of an average newborns foot?

A doctor has provided 1 answer

A member asked:

How accurate are the charts with crown rump fetus measurements? What does it mean being in the 5th, 50th and 95th percentile?

A doctor has provided 1 answer

A member asked:

Found out I was 13 wks 3 days pregnant on Nov.10 so conception date is Aug 7. How accurate are crown/rump measurements in days? Paternity in question

A doctor has provided 1 answer

A member asked:

At an ultrasound, what determines if you are 12 weeks or 12 weeks + 4 days? Are measurements this precise? And the accuracy correlates with your LMP too?

A doctor has provided 1 answer

People also searched for:

Findings on Ultrasound: Mean Sac Diameter: 2.9 Crown to rump length: 0.7 Yolk sac: 0.4 Heartbeat: Not visualized Estimated Ultrasound age based off of CRL is 6 weeks 4 days Last period was end of August. Is this necessarily a miscarriage?
Could an ultrasound mistake a mole for a fetal pole? If crown-rump length is measured - is there definitely a fetus? It was measured at 4 mm.
On July 22 I had an ultrasound & my uterus measured 10.4x6.7x7.3cm sac size 3.4cm crown-rump length 1.7cm EDD 2/26/16 When did i concieve? Was it before June 11? LMP was May 20 Please help.
During an injection in my left buttock the 25 gauge needle broke off inside. An X-ray and two ultrasounds cannot locate it. What's the next step?
I went for an ultrasound The Tech looked at the soft tissue masses on my lower back, buttock and thigh he told me he had to look at my liver.Why?

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

For Businesses

Direct Primary Care for OrganizationsFor DMEs and PharmaciesFor Health PlansFor Providers

Company

About UsSupport CenterContact Us

Health Content

Health TopicsDoctor Q&A by Specialty

Join Us

For DoctorsJobs
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.