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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Accurate Are Ultrasounds At Predicting Gestational Age?

the first time I had sex with my girlfriend was 83 dags ago and the ultra sounds pictures shows the age of the foster (babe) 89 dags. and that means thereare 6 dags lost I mean I didn't have sex with here at that time, and I am really in doubt about being the father.

I need an advise if the ultra sound can make mistakes about giving the exact right age.

hope to hear soon from you

best regards
Wed, 30 Dec 2015
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OBGYN,  's  Response
Hello,
I have gone through your query and here are your answers: firstly, the age of any pregnancy is determined clinically from the first day of the last menstrual period. Secondly, the gestation age in sonogram also is determined on the same basis; a pregnancy detected one week after the missed period is considered as 5 weeks gestation, counting from the last menstrual period. So, based on this, it is more likely that YOU are the biological father. There can be a variation of 3-4 days in a very early pregnancy in a sonogram as this is the period when the age of a pregnancy can be determined most accurately. Hope your query has been clarified.
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How Accurate Are Ultrasounds At Predicting Gestational Age?

Hello, I have gone through your query and here are your answers: firstly, the age of any pregnancy is determined clinically from the first day of the last menstrual period. Secondly, the gestation age in sonogram also is determined on the same basis; a pregnancy detected one week after the missed period is considered as 5 weeks gestation, counting from the last menstrual period. So, based on this, it is more likely that YOU are the biological father. There can be a variation of 3-4 days in a very early pregnancy in a sonogram as this is the period when the age of a pregnancy can be determined most accurately. Hope your query has been clarified.