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The aim of the study is to develop a method for early diagnosis of intrauterine infection (IUI). A study of markers of inflammation in the venous blood of 60 pregnant women was conducted. The study was followed by a retrospective assessment of the outcomes of pregnancies and childbirth. Of these, 33 patients with a gestation period of more than 37 weeks (full-term pregnancy) and, accordingly, 27 patients from whom the blood sample was taken at a period of less than 37 weeks - patients with the threat of premature birth (PB). PB is the main factor contributing to the development of IUI. 27 patients were diagnosed with premature rupture of the membranes (PROM). Of these, 15 are with the threat of PB. 8 of them had a diagnosed IUI. In all cases of diagnosed PROM, including those with IUI, the concentration of nitrite and nontiolate nitroso compounds (NO2-+RNO) in the mother's blood plasma was 2.3±1.2 µM, while normally it does not exceed 0.1 µM (p<0.001). Regardless of the duration of pregnancy. The use of antibiotics in the case of PROM contributed to the normalization of the concentration (NO2-+RNO). Therefore, increasing of this indicator is result of bacterial infection. Indications of other markers of inflammation: the number of leukocytes in venous blood and in a smear of vaginal contents, the level of C-RB did not significantly change in both PROM and IUI (p>0.1). Since the concentration index (NO2-+RNO) increased in almost all cases of PREM, unlike all other clinical and biochemical indicators used in modern medicine, there is an obvious sense of its use for the current monitoring of the health of pregnant women. But it is still impossible to say unequivocally about the possibility of monitoring the fetal health by concentration (NO2-+RNO) in the mother's blood., Competing Interests: The authors declare no conflict of interest.