Noninflammatory (such as osteoarthritis) | Inflammatory (such as rheumatoid arthritis) | Septic | Hemorrhagic | |
WBC count (cells/microL) | <2000 | 2000 to 20,000 | >20,000* | Up to 1 WBC for every 1000 RBCs |
Percent neutrophils | <25% | 50 to 75% | >75% | <50%¶ |
Crystal examination by polarized microscopy | Negative | May demonstrate uric acid or CPPD crystals | Negative | Bloody |
Stain, culture for microorganisms | Negative | NegativeΔ | May be positive (depending on organism, prior antibiotic exposure) | Negative |
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