Septic Arthritis and Arthrocentesis Landmarks

SYNOVIAL FLUID ANALYSIS

  • sWBC > 50,000 – essentially rules IN septic arthritis
  • sWBC < 50,000 – unhelpful for clinical diagnosis
  • Gram Stain: useful when positive, unhelpful when negative
  • Culture: not available when we need it in the ED
  • Lactate >10 – essentially rules IN septic arthritis

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