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

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

Screening variable	Clinical reference^a	n Total	Sensitivity	Specificity	PPV	NPV
CBG	VPG^a	1057	49/71 (69.01%)	944/986 (95.74%)	49/91 (53.84%)	944/966 (97.72%)
HbA1c^b	VPG^a	1057	60/71 (84.50%)	782/986 (79.31%)	60/264 (22.72%)	782/793 (98.61%)

CBG capillary fasting blood glucose, VPG venous fasting plasma glucose, PPV positive predictive value, NPV negative predictive value
^aCBG ≥ 126 mg/dl; VPG ≥ 126 mg/dl and clinical diagnosis
^bHbA1c ≥ 6.5%

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