Figure 3

In 20 patients with predefined hematocrit target of 28% (n = 100 values) both methods correlated well with r² = 0.8, a kappa of 0.58 reflected a fair agreement of the methods. Values located within square III below 28% reflect patients who require RBC transfusions according to both methods of analysis, whereas square II shows 21 patients (21%) in whom hematocrit determined by the central laboratory would have suggested RBC transfusion while blood gas analysis would not have indicated RBC transfusion.