2 doctors weighed in:

My fetus measure 6.5 CM CRL,13 weeks and 158 heart rate.How much the ultrasound can be off ?

2 doctors weighed in
Dr. Asha Kamnani
Obstetrics & Gynecology
1 doctor agrees

In brief: 5 to 7 days

Ultra sounds in the first trimester is pretty accurate.

In brief: 5 to 7 days

Ultra sounds in the first trimester is pretty accurate.
Dr. Asha Kamnani
Dr. Asha Kamnani
Thank
Get help from a real doctor now
Dr. Jane Van Dis
Board Certified, Obstetrics & Gynecology
15 years in practice
47M people helped
Continue
111,000 doctors available
Read more answers from doctors