<prompt> Abruptio placentae can be classified on the basis of NOT RELATED - GYNAnatomic locations of placentaPathological features including blood coagulation profileClinical findingsInvestigations using ultrasound  <response>: Abruptio placentae is classified in 4 grades - grade 0 to grade 3 according to case classification. Depending upon the degree of placental abruption and its clinical effects including bleeding per vaginum, uterine tenderness, condition of fetus, features of shock, associated coagulation defect and kidney function, cases are classified into four grades. 