Retained Placenta Definition of Retained Placenta: When placenta is not expelled out 30 minutes after birth of the baby. Symptoms of retained placenta are described below. Causes of Retained Placenta: Poor voluntary expulsive effort after prolonged labour Atonic uterus Hour glass contraction Morbid adherent placenta Diagnosis of Retained Placenta: Time spent … [Read more...] about Retained Placenta