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Synovial Fluid White Blood Cell Count
Aka: Synovial Fluid White Blood Cell Count, Synovial Fluid WBC
- Technique
- Wright's Stain for cell count with differential
- Normal Synovial Fluid
- Less than 200 White Blood Cells (WBC) per mm3
- Polymorphonuclear Leukocytes (PMN) less than <50%
- Non-Inflammatory fluid: 200 - 2000 WBC/mm3
- Osteoarthritis or Degenerative Joint Disease
- Trauma
- Osteochondritis dissecans
- Rheumatic Fever
- Chronic gout
- Chronic Pseudogout
- Progressive Systemic Sclerosis (Scleroderma)
- Polymyositis
- Systemic Lupus Erythematosus (SLE)
- Neuropathic arthropathy (Hemorrhage may be present)
- Erythema Nodosum
- Pigmented villonodular synovitis
- Hypertrophic Osteoarthropathy
- Inflammatory fluid: 2000 - 50,000 WBC/mm3 (mild < 20,000)
- Rheumatoid Arthritis
- Psoriatic Arthritis
- Ankylosing Spondylitis
- Acute Rheumatic Fever
- Acute gout
- Acute Pseudogout
- Progressive Systemic Sclerosis (Scleroderma)
- Polymyositis
- Systemic Lupus Erythematosus (SLE)
- Reiter's Syndrome
- Inflammatory Bowel Disease Arthritis
- Fungal Infections
- Viral Infections
- Bacterial infections (partially treated)
- Septic fluid: Over 50,000 WBC/mm3 (especially >100,000)
- Septic Arthritis until proven otherwise
- Reference
- Kolba (1984) Prim Care 11:211-8