7 doctors weighed in:
Hi, i'll just make my question short. I have a result of ultrasound here, is it possible to know from this result how old the baby is? Thank you!
7 doctors weighed in

Dr. Walter Kobasa
Obstetrics & Gynecology
6 doctors agree
In brief: Yes
The ultrasound machine takes and records measurements.
They can calculate to age of the baby. Ask the person who ordered it, they will be able to give you an approximate age of the baby.

In brief: Yes
The ultrasound machine takes and records measurements.
They can calculate to age of the baby. Ask the person who ordered it, they will be able to give you an approximate age of the baby.
Dr. Walter Kobasa
Dr. Walter Kobasa
Thank
Dr. Kristi Kohl
Family Medicine
1 doctor agrees
In brief: First trimester CRL
In the first trimester, crown-rump length of your baby and the gestational sac measurements are the most accurate for dating.
This will give your baby's age within a week. If your due date based on your last period is more than a week off, your due date should be changed. The second and third trimester ultrasound measurements (femur length, head and abdominal circumference) are less accurate.

In brief: First trimester CRL
In the first trimester, crown-rump length of your baby and the gestational sac measurements are the most accurate for dating.
This will give your baby's age within a week. If your due date based on your last period is more than a week off, your due date should be changed. The second and third trimester ultrasound measurements (femur length, head and abdominal circumference) are less accurate.
Dr. Kristi Kohl
Dr. Kristi Kohl
Thank
1 comment
Dr. Kristi Kohl
You can "guesstimate" using an online pregnancy calculator (conception usually is 2 weeks after the last menstrual period which can be confusing with dates-- if she's 10 weeks pregnant, conception was 8 weeks ago) but the true test of paternity will be after the baby's born. This will need done if she is claiming that he is the father of the baby regardless of when they broke up or last had sex.
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