Lab

Synovial Fluid White Blood Cell Count

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Synovial Fluid White Blood Cell Count, Synovial Fluid WBC, Synovial Fluid Cell Count, Joint Fluid Leukocytes

  • See Also
  1. Monoarthritis
  2. Synovial Fluid Crystals
  3. Synovial Fluid
  • Technique
  1. Wright's Stain for cell count with differential
  1. Less than 200 White Blood Cells (WBC) per mm3
  2. Polymorphonuclear Leukocytes (PMN) less than <50%
  • Labs
  • Non-Inflammatory fluid - 200 - 2000 WBC/mm3
  1. Osteoarthritis or Degenerative Joint Disease
  2. Trauma
  3. Osteochondritis Dissecans
  4. Rheumatic Fever
  5. Chronic gout
  6. Chronic Pseudogout
  7. Progressive Systemic Sclerosis (Scleroderma)
  8. Polymyositis
  9. Systemic Lupus Erythematosus (SLE)
  10. Neuropathic Arthropathy (Hemorrhage may be present)
  11. Erythema Nodosum
  12. Pigmented villonodular synovitis
  13. Hypertrophic Osteoarthropathy
  • Labs
  • Inflammatory fluid - 2000 - 50,000 WBC/mm3 (mild < 20,000)
  1. Rheumatoid Arthritis
  2. Psoriatic Arthritis
  3. Ankylosing Spondylitis
  4. Acute Rheumatic Fever
  5. Acute gout
  6. Acute Pseudogout
  7. Progressive Systemic Sclerosis (Scleroderma)
  8. Polymyositis
  9. Systemic Lupus Erythematosus (SLE)
  10. Reiter's Syndrome
  11. Inflammatory Bowel Disease Arthritis
  12. Fungal Infections
  13. Viral Infections
  14. Bacterial Infections (partially treated)
  • Labs
  • Septic fluid - Over 50,000 WBC/mm3 (especially >100,000, PMNs >75%)
  1. Septic Arthritis until proven otherwise
  • Reference
  1. Kolba (1984) Prim Care 11:211-8