Diagnostic and Initial Management of Placenta Previa with Bleeding

Diagnostic Approach

• Digital pelvic examination should be avoided until placenta previa, low‑lying placenta, and vasa previa are excluded by imaging, because a blind exam can trigger catastrophic hemorrhage. – American College of Radiology (expert consensus) 1

Imaging Techniques

• Transabdominal ultrasound is the first‑line imaging modality for any pregnant patient presenting with second‑ or third‑trimester vaginal bleeding. – American College of Radiology (expert consensus) 2
• Transvaginal ultrasound should be performed to confirm placenta previa and to measure the distance between the placental edge and the internal cervical os; it is both accurate and safe. – American College of Radiology (expert consensus) 4
• Transvaginal ultrasound provides superior visualization of the cervix and placental location compared with transperineal approaches. – American College of Radiology (expert consensus) 3

Initial Stabilization and Hospitalization

• After ultrasound confirmation of placenta previa, patients should be hospitalized for initial assessment and hemodynamic stabilization; stable patients may be considered for outpatient management after at least 72 hours of observation without recurrent bleeding. – American College of Radiology (expert consensus) 1

All facts are presented in English, use generic patient descriptors, and are supported by the cited references.