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Table 2 Sensitivity, specificity, positive predictive values (PPV), and negative predictive values (NPV) of CBG and HbA1c based on WHO’s recommended cut points

From: Performance of diabetes screening tests: an evaluation study of Iranian diabetes screening program

Screening variable Clinical referencea n
Total
Sensitivity Specificity PPV NPV
CBG VPGa 1057 49/71 (69.01%) 944/986 (95.74%) 49/91 (53.84%) 944/966 (97.72%)
HbA1cb VPGa 1057 60/71 (84.50%) 782/986 (79.31%) 60/264 (22.72%) 782/793 (98.61%)
  1. CBG capillary fasting blood glucose, VPG venous fasting plasma glucose, PPV positive predictive value, NPV negative predictive value
  2. aCBG ≥ 126 mg/dl; VPG ≥ 126 mg/dl and clinical diagnosis
  3. bHbA1c ≥ 6.5%