In this study, the method of fluorescence spectroscopy was used to improve the diagnostics and prediction of sepsis, pyo-inflammatory diseases and postpartum endometritis. At the first stage of the study, the researcher explored the fluorescence spectra of dilutions of serum with centrifuged and non-centrifuged bacterial culture (6-day crop sugar broth with Staphylococcus aureus), distilled water, 20% albumin and sugar broth. The focus was on the influence of treatment, including infusion therapy, on the fluorescence spectral characteristics of a patient's serum. At the second stage, the method of fluorescence spectroscopy was used for the diagnosis of sepsis in vivo. At the third stage, the analyst scrutinized the peculiarities of pregnancy, childbirth, and the postpartum period (totally, 40 parameters) in patients with postpartum pyo-inflammatory diseases and in the control group.