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Table 3 Factors that could influence assessment of the ultrasound-based estimated date of delivery

From: Adherence to Swedish national pregnancy dating guidelines and management of discrepancies between pregnancy dating methods: a survey study

  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)
  1. CRL crown–rump length, BPD biparietal diameter
  2. aMore than one answer could be reported per unit. In six of the 38 units, no answer was marked