II. Technique

  1. Wright's Stain for cell count with differential

III. Labs: Normal Synovial Fluid

  1. Less than 200 White Blood Cells (WBC) per mm3
  2. Polymorphonuclear Leukocytes (PMN) less than <50%

IV. Labs: Non-Inflammatory fluid - 200 - 2000 WBC/mm3

VI. Labs: Septic fluid - Over 50,000 WBC/mm3 (especially >100,000, PMNs >75%)

  1. Septic Arthritis until proven otherwise

VII. Reference

  1. Kolba (1984) Prim Care 11:211-8

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