Table 3 Factors that could influence assessment of the ultrasound-based estimated date of delivery
Number of unitsa | (%) | |
|---|---|---|
Large discrepancy between last menstrual period and ultrasound estimates | 10 | (3, 26) |
Fetal sex | 3 | (7, 9) |
Self-reported reliable date of conception or positive ovulation test | 10 | (3, 26) |
Fetal malformations affecting fetal measurements | 30 | (78,9) |
Discrepancy between ultrasound pregnancy dating and earlier CRL measurements | 17 | (44,7) |
Discrepancy between ultrasound pregnancy dating and earlier BPD measurements | 20 | (52,6) |
Several combined factors indicating that the estimated gestational age by ultrasound is less reliable | 24 | (63,2) |