Open Access
Table 1
Physical and cytological characteristics of synovial fluid.
| Colour | Clarity | White blood cell count (cells/mm3) | Staining | |
|---|---|---|---|---|
| Normal | Colourless | Translucent | <200 | |
| Non-inflammatory | Straw like/yellow | Translucent | 200–2000 | |
| Inflammatory | Yellow | Cloudy | 2000–50,000 (>50% neutrophil) | |
| Septic | Yellow | Cloudy | >50,000 (>75% neutrophil) | Gram stain may be positive |
| Tubercular | Straw like | Cloudy/translucent | 8000–12,000 (>50% neutrophil, >10% lymphocytes) | ZN stain may be positive |
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