Figure 2.

In 30 patients with a predefined hematocrit target of 24% (n = 150 values) both methods showed a significant correlation of r² = 0.87 and kappa was 0.56, indicating a fair agreement of the methods. Values located within the lower field below 24% (square III) reflect patients who need to be transfused according to both methods of analysis; in contrast, square II shows 34 patients (22.7%) who would have been transfused according to the hematocrit values determined by the central laboratory.