| OA | Inflammatory / RA | Gout | Infection | |
| WCC per mm3 | 2000 | < 75 000 | < 50 000 | > 80 000 |
| % Neutrophils / PMN | < 25% | < 50% | > 75% | > 75% |
| Viscosity | Normal | Variable | High | Low |
| Glucose (percentage relative to serum) | Normal | Low | Normal | Low |
| Other | Crystals |
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