Lab

Synovial Fluid White Blood Cell Count

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Synovial Fluid White Blood Cell Count, Synovial Fluid WBC

  • Technique
  1. Wright's Stain for cell count with differential
  • Normal Synovial Fluid
  1. Less than 200 White Blood Cells (WBC) per mm3
  2. Polymorphonuclear Leukocytes (PMN) less than <50%
  • Non-Inflammatory fluid
  • 200 - 2000 WBC/mm3
  • Inflammatory fluid
  • 2000 - 50,000 WBC/mm3 (mild < 20,000)
  • Septic fluid
  • Over 50,000 WBC/mm3 (especially >100,000)
  1. Septic Arthritis until proven otherwise
  • Reference
  1. Kolba (1984) Prim Care 11:211-8