Reassigning EDD based on LMP date-ultrasound discrepancy

Gestational age (weeks+days) based on the first day of LMP	Change LMP-based EDD to ultrasound-based EDD if ultrasound-based gestational age differs from LMP-based gestational age by more than:
≤8+6	5 days
9+0 to 13+6	7 days
14+0 to 15+6	7 days
16+0 to 21+6	10 days
22+0 to 27+6	14 days
≥28+0	21 days

EDD: estimated date of delivery; LMP: last menstrual period.

Data from: American College of Obstetricians and Gynecologists. Committee Opinion No 700: Methods for Estimating the Due Date. Obstet Gynecol 2017; 129:e150.

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Reassigning EDD based on LMP date-ultrasound discrepancy