Test		Sensitivity (%)	Specificity (%)	PPV*	NPV*	Medicare reimbursement†
OGTT (two hour)		Reference standard				$19
Random blood glucose level11 ‡
	≥ 140 mg per dL (7.8 mmol per L)	55	92	30.5	97	$6
	≥ 150 mg per dL (8.3 mmol per L)	50	95	39.9	96.7
	≥ 160 mg per dL (8.9 mmol per L)	44	96	41.2	96.4
	≥ 170 mg per dL (9.4 mmol per L)	42	97	47.2	96.3
	≥ 180 mg per dL (10.0 mmol per L)	39	98	55.5	96
A1C levels (%)12 §
	6.1	63.2	97.4	60.8	97.6	$14, serum test or point of-care test
	6.5	42.8	99.6	87.2	96.5
	7.0	28.3	99.9	94.7	95.6
Diabetes Risk Calculator13,14		78.2 to 88.2	66.8 to 74.9	6.3 to 13.6	99.2 to 99.3	Free