Diagnosis

Placenta previa is diagnosed through ultrasound, either during a routine prenatal appointment or after an episode of vaginal bleeding. Most cases of placenta previa are diagnosed during a second trimester ultrasound exam.

Diagnosis might require a combination of abdominal ultrasound and transvaginal ultrasound, which is done with a wandlike device placed inside your vagina. Your health care provider will take care with the position of the transducer in your vagina so as not to disrupt the placenta or cause bleeding.

If your health care provider suspects placenta previa, he or she will avoid routine vaginal exams to reduce the risk of heavy bleeding. You might need additional ultrasounds to check the location of your placenta during your pregnancy to see if placenta previa resolves.

May 17, 2017
References
  1. Lockwood CJ, et al. Clinical manifestations and diagnosis, and course of placenta previa. http://www.uptodate.com/home. Accessed Feb. 3, 2017.
  2. Frequently asked questions. Pregnancy FAQ038. Bleeding during pregnancy. American Congress of Obstetricians and Gynecologists. http://www.acog.org/Patients/FAQs/Bleeding-During-Pregnancy. Accessed Feb. 3, 2017.
  3. Lockwood CJ, et al. Management of placenta previa. http://www.uptodate.com/home. Accessed Feb. 3, 2017.
  4. Placenta previa. March of Dimes. http://www.marchofdimes.org/complications/placenta-previa.aspx. Accessed Feb. 3, 2017.
  5. Placenta previa. Merck Manual Professional Version. http://www.merckmanuals.com/professional/gynecology-and-obstetrics/abnormalities-of-pregnancy/placenta-previa. Accessed Feb. 3, 2017.
  6. Butler Tobah YS (expert opinion). Mayo Clinic, Rochester, Minn. Accessed March 1, 2017.