Transabdominal sonography is suitable for examination of the uterus during the first 14 days postpartum but from day 28 the transvaginal route is preferable. The uterine body and position, as well as the cavity, are easy to examine by ultrasound. Accumulation of fluid and debris in the uterine cavity is a common and insignificant finding of the involuting uterus. It is located in the cervical area in the early puerperium and in the whole uterine cavity in the middle part of the puerperium. Findings from uncomplicated vaginal deliveries are needed as a reference when the diagnostic efficacy of ultrasound for pathological conditions is to be tested.
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