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Table 2 Adherence to national guidelines for pregnancy dating

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

National guidelines – recommendations for pregnancy dating Unit follows guidelines Unit does not follow guidelines Missing information
(n) (%) (n) (%) (n) (%)
First trimester-based (11–14 weeks), if performed 11 28.9 26 68.5 1 2.6
CRL-based, if 11 weeks + 0 days to 12 weeks + 2 days 11 28.9 24 63.2 3 7.9
BPD-based, if 12 weeks + 3 days to 22 weeks + 5 days 34 89.5 3 7.9 1 2.6
Based on size of largest fetus in multiple pregnancies 37 97.4 0 0.0 1 2.6
Based on days since embryo transfer + number of cultivation days + 14 days in ART pregnancies 30 78.9 1 2.6 7a 18.5
  1. CRL crown–rump length, BPD biparietal diameter, ART artificial reproduction technique
  2. aThree units were categorized as missing because the responder stated that the estimated date of delivery was provided by the ART clinic