KRT88P and anemia (phenotype): Accuracy, sensitivity, and specificity of HBc for predicting anemia at a low transfusion threshold (<7 g/dL) were greater with values of 92.7 (95% CI 90.3, 95.2), 69.6 (95% CI 50.8, 88.4), and 94.0 (95% CI 91.7, 96.4), respectively (S3 Table).