Knee Effusions - Arthrocentesis Interpretation Inflammatory arthritis: • Color: Yellow-> Green • Clarity: Opaque • Viscosity: Low • WBC/mm3: 2000->150,000 • PMN's: > 50% • Mucin clot: Good to poor • Culture: Negative Septic • Color: Yellow • Clarity: Opaque • Viscosity: Variable • WBC/mm3: 15,000> 200,000 • PMN's: ->75% • Mucin clot: poor • Culture: Mostly positive Non-lnfiammatory: • Color: Yellow • Clarity: Transparent • Viscosity: High • WBC/mm3: 200> 2000 • PMN's: < 25% • Mucin clot: Good • Culture: Negative OTHERS: • Hemarthorosis- Large number of RBC's Crystal analysis: • MSU: Gout • CPPD: Pseudogout Additional DX: • Lyme: Serological testing • Gonococcal: Identify N gonorrhea via nucleic acid amplification of blood/synovial fluid • TB: Synovial membrane histo-anthology and culture • Fungal: Fungal stain and culture or synovial membrane histopathology Dr. Ravi Singh @rav7ks #Knee #Effusions #Arthrocentesis #Interpretation #diagnosis #septic #joint #fluid #analysis
