A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. Most dating scans are done with a trans-abdominal transducer and a fullish bladder. If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures.
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Metrics details. Assessing gestational age by ultrasound can introduce a systematic bias due to sex differences in early growth. This cohort study included data on 1, births recorded in the Swedish Medical Birth Register.
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