Tests and diagnosis

By Mayo Clinic Staff

If you have risk factors for placenta accreta during pregnancy — such as the placenta partially or totally covering the cervix (placenta previa) or a previous uterine surgery — your health care provider will carefully examine the implantation of your baby's placenta.

Techniques to help diagnose placenta accreta might include:

  • Imaging tests. Through ultrasound or magnetic resonance imaging (MRI), your health care provider can evaluate how the placenta is implanted in your uterine wall.
  • Blood tests. Your health care provider might test a sample of your blood for an otherwise unexplained rise in the amount of alpha-fetoprotein — a protein that's produced by the baby and can be detected in the mother's blood. Such a rise has been linked to placenta accreta.
March 28, 2015

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