Observations were performed on 20 healthy pregnant women and 84 women with diabetes on 38-40 weeks of gestation. All pregnant conducted obstetric examination, determined the glycemic profile, urinalysis, glucose, ketone bodies, acetone. The regulatory-adaptive status was evaluated on a sample of cardio-respiratory synchronism. Registration of uterine activity, along with the movements of the fetus and the fetal heart rate was monitored by external cardiotocography. To determine the functional state of the fetus were used ultrasound. It was found that among 34 pregnant women 9 of them had incorrect diagnosis compensated diabetes, which had been disproved by values of regulatory-adaptive status indicated decompensated diabetes. Later the diagnosis had been proved. Thus, the question of delivery of pregnant women with diabetes should not only be on the level of blood glucose, glycated hemoglobin, fetal biophysical profile data, but also on the regulatory-adaptive status which is determined by the parameters of the sample cardiorespiratory synchronism