We report the computer control system of simultaneous monitoring of cardiotocography and pulse oximetry during labour. Five of twenty five patients have abnormal CTG results with oxygen saturation over 30%. In the three subjects severe late decelerations were related with decrease of saturation to 20%. Mean SaO2 measurements ranged from 62% at the early stage of labour to 45% in the second stage. We conclude that fetal pulse oximetry plays important complementary role among methods of intrapartum monitoring and it will be used in every case with suspicious or pathological CTGm.