General screening of singleton pregnancies for preterm delivery by adding cervical length measurement with transvaginal ultrasound to second trimester routine fetal ultrasound examination has been advocated1 . Reference ranges of cervical length are available from 11 to 40 weeks of gestation.2 In the Nordic countries, second trimester routine ultrasound examinations are performed by specially trained midwife sonographers, and if screening for preterm delivery were to be introduced, cervical length measurements would be done by them. Therefore, we wanted to estimate the resources needed to train midwife sonographers to measure cervical length with transvaginal ultrasound and the time needed for cervical length measurement.

中文翻译：

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教助产士超声技师在孕中期使用经阴道超声测量宫颈长度所需的资源

提倡在孕中期常规胎儿超声检查中加入经阴道超声宫颈长度测量，对单胎妊娠早产进行一般筛查1。宫颈长度的参考范围为妊娠 11 至 40 周。2 在北欧国家，孕中期常规超声检查由受过专门培训的助产士超声检查师进行，如果要引入早产筛查，宫颈长度测量将被由他们完成。因此，我们想估算培训助产士超声技师使用经阴道超声测量宫颈长度所需的资源以及测量宫颈长度所需的时间。