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Table 1 Protocol for re-dating the pregnancy by ultrasound

From: Gestational age assessment in malaria pregnancy cohorts: a prospective ultrasound demonstration project in Malawi

Biometric measurements Gestational age by u/s Accuracy Criteria for re-dating
BPD and FL < 20 weeks ± 7 days Pregnancy re-dated by u/s if measurements > 7 days different from menstrual dates
BPD, FL, & AC 20 to 28 weeks ± 14 days Pregnancy re-dated by u/s if measurements > 14 days different from menstrual dates
BPD, FL, & AC > 28 weeks ± 21 days Pregnancy re-dated by u/s if measurements > 21 days different from menstrual dates
  1. u/s ultrasound, BPD biparietal diameter, FL femur length, AC abdominal circumference.