Help a dumb IM

[Mav]

I'm taking Step 2 TOMORROW!! And need a favor.

First Aid and Secrets say the most accurate ultrasound to assess fetal age is at 16-20 weeks.. but NMS says ultrasound gets less accurate as pregnancy progresses and that the most accurate is at 10 weeks. Blueprints says people "typically" get u/s at 16-20, but it doesn't say it's the most accurate.

What's the answer?? I'm going with whatever you tell me!!

Thanks..

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[pimmar]

Most accurate is during first trimester because that is when one can determine crown rump length best, the later on during pregnancy U/S becomes less accurate. Good luck!!!