Postpartum hemorrhage (PPH) is a potentially life threatening condition, and it remains the leading cause of maternal morbidity all over the world. The accurate estimation of postpartum blood loss is significant for choosing appropriate precaution and treatment in the patients with PPH. The clinical common methods of quantify postpartum blood loss include visual estimation, planimetric method, gravimetric method, hemoglobinometry and shock index. In recent years, a new and quite accurate specialized blood collection bag has been put in clinical practice for estimation of postpartum blood loss.