Table II.
Sensitivity, specificity, positive predictive value, negative predictive value, positive diagnostic likelihood ratio, and negative diagnostic likelihood ratio of total calcium in the prediction of ionized hypercalcemia in cats
| All cats | Cats with CRF | Cats with conditions other than CRF | Cats with hypoalbuminemia | |
|---|---|---|---|---|
| Sensitivity | 35 | 52 | 22 | 46 |
| Specificity | 99 | 94 | 100 | 98 |
| Positive predictive value | 87 | 80 | 100 | 85 |
| Negative predictive value | 88 | 82 | 89 | 88 |
| Positive diagnostic likelihood ratio | 31.1 | 9.2 | (100)a | 23.1 |
| Negative diagnostic likelihood ratio | 0.66 | 0.51 | 0.77 | 0.55 |
a
The PDLR is essentially 100 but cannot be truly calculated due to the absence of false positives.