Abstract
To compare first-trimester scan results between audited (AS), according to the Fetal Medicine Foundation criteria, and non-audited sonographers (NAS). Retrospective observational study of N = 629 and N = 1290 NT and CRL measurements done by AS and NAS, respectively. For similar examined populations (similar CRL and maternal age at examination) NT values were significantly lower in NAS with NT of 1.0 mm or less in 26.9% of measurements taken by NAS (vs. 0.3% in AS). NT differed significantly between NAS and AS in all maternal age groups, except for patients below 24 years of age and in all CRL categories. Training of sonographic skills in fetal medicine needs to be complemented by a regular audit to ensure adequate quality of the measurements.
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