Validation of the WHO Hemoglobin Color Scale Method

Table 1

Reliability of WHO color scale with the reference method (cyanmethemoglobin method).

Hemoglobin concentration (g/dL)	5–7	7.1–9	9.1–11	11.1–13	>13.1
Specificity %	52.04	53.76	52.94	49.01	50.68
Sensitivity %	50	28.57	46.66	55.10	55.55
Positive prediction %	2.08	4.44	14.89	50.94	29.41
Negative prediction %	98.08	90.9	84.90	53.19	75.51