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Cesarean section
Cesarean section
Anatomy of a normal placenta
Anatomy of a normal placenta

Placental failure
Definition:

The placenta is the structure that brings oxygen and nutrients to a fetus, and gets rid of carbon dioxide and other wastes. The placenta is rich with blood vessels, and by the third month normally releases large amounts of hormones (particularly progesterone) that are necessary to maintain the pregnancy.

Placental failure occurs when the placenta fails to produce any progesterone, and usually results in loss (termination) of the pregnancy.

See also placental insufficiency.
Review Date: 1/27/2002
Reviewed By: Dominic Marchiano, M.D., Department of Obstetrics & Gynecology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.
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