Accuracy of non-invasive measurement of haemoglobin concentration by pulse co-oximetry during steady-state and dynamic conditions in liver surgery

SpHb correlated moderately with Hbsatlab with a slight underestimation in both phases in patients undergoing major hepatic resection. Accuracy increased for lower Hbsatlab values but decreased in the presence of colloid solution. Further improvements are necessary to improve device accuracy under these conditions, so that SpHb might become a sensitive screening device for clinically significant anaemia.