Pulse oximetry in preterm infants.

Abstract
One hundred and twenty five measurements of arterial oxygen saturation (StcaO2) obtained with a transcutaneous pulse oximeter were compared with direct arterial oxygen tension (PaO2) in 13 preterm infants with predominantly fetal haemoglobin. StcaO2 of 86-92% corresponded to PaO2 of 5-13 kPa. StcaO2 above 92%, however, was sometimes associated with PaO2 above 13 kPa.