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

What if i don't know my lmp how will a doctor determine my conception date?

A doctor has provided 1 answer

Ultrasound: First trimester ultrasound is very accurate at pinning down conception date within about a week or so.

Answered 3/2/2014

4.4k views

Thank

Related Questions

A member asked:

The doctors determined my due date from an estimated lmp, it was nov4 . Sept 16, i got an ultrasound that read oct25 which date is accurate?

A doctor has provided 1 answer

A member asked:

If i don't membe my LMP in april and my conception date is may6 but i had sex wit my ex april22th is it's possible it's my ex or my boyfriend?

A doctor has provided 1 answer

A member asked:

Don't need to pinpoint conception day, but two first trim ultrasound give same due date we have no lmp to go off, how accurate is age of our baby?

A doctor has provided 1 answer

A member asked:

If i don't member my LMP in april and had sex wit my ex april22th and conception date is may6 is this baby my ex or boyfriend?

A doctor has provided 1 answer

A member asked:

What does it mean if ultrasound, doesn't match lmp, in terms of conception date and due date?

3 doctors weighed in across 3 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:

Hi doctors i had a ultrasound yesterday it said due aug 29 what is more accurate LMP or ultrasound i need my most accurate conception date please help?
When does it mean when a doctor considers the LMP due date and conception if the ultrasound is in a 7-10 day agreement with the lmp? Need an example
When a doctor says margin of error is 3-5 days in first trimester us are they talking about lmp, due date, or conception date?
How do doctors determine the conception date?
How accurate are the doctors measurements of the baby to determine baby weeks, due date, conception, ovulation etc...

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.