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30 units applied a great gestational duration of 39 weeks + six weeks so you can estimate this new time regarding delivery in connection with maternity relationships and you will five gadgets made use of 40 months + 0 weeks. A couple of gadgets was basically not sure on what gestational length was used (Table step 1).
CRL-dependent maternity dating are mentioned: “maternity relationship 
because of the CRL [is performed] only from time to time (natural fetal reputation, favorable activities)” and you will “I wait for advice
For the twenty-six equipment (68%), for around element of its inhabitants, pregnancy relationship behavior was indeed changed regarding the second in order to earliest trimester 2008–2015. In the 21 products (55%), pregnancy matchmaking are centered on an initial-trimester ultrasound only when the fresh new BPD is ?21 mm (equal to a dozen months + 3 days). Into the four tools (13%), pregnancy matchmaking is actually constantly predicated on next-trimester ultrasound assessments, even if earliest-trimester measurements existed. You to definitely unit got shed address. .. [our] experience would be the fact CRL really works even worse”. In a nutshell, during the twenty-six products (68%), first-trimester ultrasound inspections between eleven weeks + 0 months and you may several days + two days weren’t employed for maternity relationship (Dining table dos).
This new adherence so you’re able to maternity matchmaking information was high having BPD measurements, multiple pregnancies, and you will fake reproduction techniques pregnancies (Table 2). One product commented that alter was made “because [label out-of senior ultrasound expert] made clear one … recommendations try appropriate simply for BPD proportions.” Respondents stated the equipment inside the Stockholm State got wanted to end CRL-based dating due to a thought increase in postterm prices: “I, for the Stockholm, decided on dating based on BPD ?21 mm accomplish an identical.”