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Comparison of diagnostic values between serum total CO2 and approximated HCO3−
| Serum total CO2 | Approximated HCO3− | |
|---|---|---|
| Sensitivity (%) | 91.7 | 84.8 |
| Specificity (%) | 73.4 | 87.9 |
| Positive predictive value (%) | 72.5 | 84.2 |
| Negative predictive value (%) | 92.0 | 88.4 |
| Accuracy (%) | 81.3 | 86.6 |
| Pre-test probability (%) | 43.3 | 43.3 |
| Positive post-test probability (%) | 72.5 | 84.2 |
| Negative post-test probability (%) | 8.0 | 11.6 |
CO2, carbon dioxide; HCO3−, bicarbonate ion.
