TABLE 4.

Evaluation of Serum HCO3 Concentration Cutoff Values

HCO3, mmol/L	Sensitivity, %	Specificity, %	PPV, %	NPV, %
Diagnosis of DKA
<15	82.1	97.7	89.4	95.8
<16	84.3	96.2	84.3	96.2
<17	88.1	94.2	78.7	97.0
<18	91.8	91.7	72.8	97.9
Classification of Severe DKA
<5	52.4	99.9	91.2	98.5
<6	85.7	99.4	81.8	99.6
<7	90.5	98.8	70.1	99.7
<8	95.2	96.7	47.6	99.9