A hemorragia pos-parto (HPP) constitui a complicacao obstetrica com maior indice de mortalidade materna em todo o mundo. Ate 90% desses obitos podem ser evitados com cuidado medico adequado. Este trabalho objetiva a atualizacao da classificacao e diagnostico da HPP com o intuito de tornar o conhecimento adequado quanto as medidas preventivas e a instituicao da terapeutica em tempo habil e de forma eficaz. The postpartum hemorrhage (PPH) is the obstetric complication with the largest maternal mortality rate all over the world. Motivated by the estimate that up to 90% of those deaths could be avoided by appropriate medical care, this work aims at supplying the professionals in charge of the attendance of the delivering women general knowledge on how to proceed before HPP situation, reducing the maternal morbimortality. It is a bibliographical revision accomplished by scientific articles obtained through searches in portals recognized in the academic-scientific group that approaches some of the definitions of PPH accepted currently, its classification and diagnosis. The knowledge of the risk factors makes possible to the assistance team to take preventive measures and to be prepared to institute the therapeutic measures, in case it is necessary, in skilled time and in an effective way. It is hoped that the correct intervention in the cases leads to a reduction of the maternal morbimortality due to that condition, something not just desirable, but feasible.