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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