Figure 2.
Trend plot of a surgical case in which blinded SpHb values (red line) are shown with lab-Hb measurements from both a CO-Oximeter (blue circles) and hematology analyzer (purple triangles). Note in (A) the larger-than-expected difference between lab-Hb values from 2 different devices. B and C, How differences between lab-Hb and single SpHb values during a time of rapidly changing hemoglobin can be misleading. D, The variation between 2 lab-Hb devices can change. Actual patient trend plot courtesy of Masimo.