Objective: determine the usefulness of the acute phase inflammatory risk index as a predictor of severity in preeclampsia. Material and method: an analytical observational study of diagnostic tests was carried out, in which 152 pregnant women in the third trimester of pregnancy attended by the Gynecology – Obstetrics service of the Belén Hospital of Trujillo were included, divided into two groups: 76 pregnant women with a diagnosis of preeclampsia with and without severity criteria. In these groups, the following parameters were evaluated: neutrophil/lymphocyte ratio (INL), platelet/lymphocyte ratio (PLI), hemoconcentration, hematocrit/albumin ratio (HAI), mean platelet volume (MPV), erythrocyte distribution width (RDW)  and the acute phase inflammatory risk index. Results: in the laboratory characteristics, the neutrophil lymphocyte index (NLR), platelet lymphocyte index (LPI), hemo...