In an open, prospective, comparative study, fetal oxygen saturation (FSpO2) was measured by means of intrapartum fetal pulse oximetry (IFPO) in the first stage of labor in 20 fetusses during premature labor (32 - 36 weeks of pregnancy) and the results were compared with FSpO2 values of 20 full term (39 - 41) no risk fetusses. A 30 min interval of CTG and FSpO2 continuous monitoring was statistically evaluated by means of ANOVA or Kruskal Wallis test. In all patients a good quality signal permitting the evaluation of FSpO2 in both groups was obtained. There were no significant difference in FSpO2 values between the two groups (49 +/- 7) % in the preterm labor group A and (50 +/- 6) % for the full term labor group B. The p value was 0,37 - non significant. Neither maternal nor fetal side effects of the monitoring were noted. According to the presented results during non coplicated preterm labor from 32 to 36 weeks of pregnancy the fetus is not menaced by hypoxia per se.