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Dr. Chip
Dr. Chip, Doctor (MD)
Category: Health
Satisfied Customers: 21172
Experience:  Over 20 yrs of Family Practice
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Dr. Chip. I have a question about fetal ultrasounds. Would

Customer Question

Dr. Chip. I have a question about fetal ultrasounds. Would it be possible for an ultrasound at 7 weeks to be off by 4-5 weeks? Would it be possible for a 12 week fetus to be mistaken for a 7 week fetus? Would it be possible for an 15 week fetus to be mistaken for an 11 week fetus via ultrasound?
Submitted: 7 months ago.
Category: Health
Expert:  Dr. Chip replied 7 months ago.
Hi--before I get into specifics, is there a reason you ask?
Customer: replied 7 months ago.

I would just like to know if my ultrasound dating is accurate.

Expert:  Dr. Chip replied 7 months ago.
OK--but what you said above was a little unclear to me--can you tell me specifically what the situation is?
Customer: replied 7 months ago.

I was just wondering if ultrasound dating could be off a month in the first trimester?

Expert:  Dr. Chip replied 7 months ago.
OK--and we can continue after this but, no, not off by as much as a month. Perhaps off by from one to maybe two weeks, but certainly not a month.
Customer: replied 7 months ago.

Ok I was just curious. I was trying to figure out if I got pregnant in Jan or Feb. My EDD by multiple early ultrasounds is 11/12/13. I had an ultrasound at 7 weeks and 11 weeks (also at 14, 19, 21, & 27) that all gave the same due date. It is not an issue of paternity, but I was on medications on Jan & drank a lot, so I would feel better if the pregnancy did not result from this time. I had a period in early Feb.

Expert:  Dr. Chip replied 7 months ago.
OK--but with that information it would seem fairly certain you conceived in mid February so I would go by your last period and not by the ultrasounds and so you really have no need to worry here.
Customer: replied 7 months ago.

Well my ultrasonds and my period line up exactly. My periods are a little wacky & often irregular. I was just nervous and wasn't sure about accuracy. Aren't ultrasounds supposed to be more accurate than periods? Thank you for your help.

Expert:  Dr. Chip replied 7 months ago.
Actually the due date and the fetal age are determined by a combination of the last period, the ultrasound results, and blood work. I really don't thing you should have any concern here and I'm sure your baby is healthy and fine.
Dr. Chip, Doctor (MD)
Category: Health
Satisfied Customers: 21172
Experience: Over 20 yrs of Family Practice
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