A presumptive diagnosis of vasa previa is usually confirmed with?

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A presumptive diagnosis of vasa previa is typically confirmed using transvaginal ultrasound, as this method provides a closer and clearer view of the cervix and surrounding structures. Transvaginal ultrasound is particularly beneficial for visualizing the fetal vessels that may be located near or crossing over the cervical os, which are characteristic of vasa previa. This technique allows for enhanced resolution and detailed imaging that helps in identifying these vessels.

While the other imaging modalities can be valuable in obstetric assessments, they are not as effective in providing the necessary clarity and detail for confirming vasa previa. For instance, abdominal CT scans and magnetic resonance imaging (MRI) are not routinely used in this context, as they involve higher levels of radiation or are not specifically tailored for such delicate observations in pregnancy. Transabdominal ultrasound, although helpful, may not give the same degree of detail in the pelvic region compared to transvaginal ultrasound. Thus, transvaginal ultrasound remains the gold standard for confirming the diagnosis of vasa previa.

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