Table 4. Association of WBC and RBC with the presence of bacteria or parasites.
| Bacteria Present | Parasites Present | |
| Presence of White Blood Cells | ||
| Sensitivity | 54.0% | 30.6% |
| Specificity | 74.2% | 69.9% |
| Positive Predictive Value | 27.4% | 10.8% |
| Negative Predictive Value | 90.0% | 89.4% |
| Presence of Red Blood Cells | ||
| Sensitivity | 21.4% | 3.7% |
| Specificity | 92.2% | 89.4% |
| Positive Predictive Value | 33.2% | 4.0% |
| Negative Predictive Value | 86.7% | 88.6% |
| Presence of Both White and Red Blood Cells | ||
| Sensitivity | 21.5% | 3.7% |
| Specificity | 92.9% | 90.1% |
| Positive Predictive Value | 35.2% | 4.3% |
| Negative Predictive Value | 86.9% | 88.7% |
Abbreviations: WBC, white blood cells; RBC, red blood cells; WBC or RBC were counted as present if laboratory records indicated scanty, few, moderate, or many cells upon microscopic evaluation.