Mul et al estimated gestational age of a pregnancy conceived by an artificial reproductive technique based on ultrasound measurements. The authors are from Queen's Medical Center Nottingham, England.
Patient selection: between 14 and 22 weeks for biparietal diameter; between 15 and 22 weeks for femur length
Parameters:
(1) biparietal diameter (BPD) in mm
(2) femur length (FL) in mm
gestational age in days =
= (1.99 * (BPD)) + 44.17
= (2.30 * (FL)) + 67.4
= (1.36 * (BPD)) + (0.78 * (FL)) + 50.16
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