Table 4.
The Laboratory Risk Indicator for Necrotizing Soft Tissue Infection
| Variable | Score |
|---|---|
| C-reactive protein (mg/dL) | |
| <15 | 0 |
| ≥15 | 4 |
| Total white blood cell count (103 per mm3) | |
| <15 | 0 |
| 15–25 | 1 |
| >25 | 2 |
| Hemoglobin (g/dL) | |
| >13.5 | 0 |
| 11–13.5 | 1 |
| <11 | 2 |
| Sodium (mmol/L) | |
| >135 | 0 |
| ≤135 | 2 |
| Creatinine (mg/dL) | |
| ≤1.59 | 0 |
| >1.59 | 2 |
| Glucose (mg/dL) | |
| ≤180 | 0 |
| >180 | 1 |
The Laboratory Risk Indicator for Necrotizing Soft Tissue Infection Adapted from reference 43. Values for each of the six parameters on the left (which may require unit conversion at different institutions) are assigned a score shown on the right. A total score of <6 suggests a 96% negative predictive value for deep necrotizing soft tissue infection (NSTI), and a score of ≥6 suggests a 92% positive predictive value for such infection.