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A 22-year-old female asked:

how accurate is an ultrasound at 13+3 weeks ? now 30 weeks and measuring 32 . worried about paternity . partners 25 days apart . due oct 10.2014

2 doctor answers2 doctors weighed in
Dr. Jeffrey Juchau
Family Medicine 33 years experience
Accurate: Early ultrasounds are the most accurate for dating. They are within 7-10 days, so partners 25 days apart would not be a problem with paternity.
Dr. Eric Weisman
Neurology 36 years experience
Difficult situation.: You would need genetic material from the father to do paternity testing. I suppose you could wait until the baby is born to see who it looks like but I'm sure you thought of that. I would consult with a fertility specialist if your GYN cannot advise you. There is another good reason to find out other than the obvious. Do you know if you are blood type Rh positive or negative.

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