OB/GYN Student Study Guide
: can be 1 week off in the first trimester, 2 weeks off in the second trimester, 3 weeks in the third trimester so… if your US differs from the EDC by LMP more than this, accept the US dating over the LMP dating. In the first half of the first trimester, use the Crown Rump Length (CRL) which is within 3 – 5 days of accuracy. Doppler ................
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