Arthrocentesis with WBC Count >2000/µl and >75% polys
-
Crystals Present in Joint Fluid:
- Gout
- Pseudogout (associated with 4 “H” diseases: hemochromatosis, hyperparathyroidism, hypomagnesemia, hypophosphatasia)
-
Cultures Positive:
- Septic arthritis
-
Cultures Negative (joint, as well as uretheral, rectal, cervical, and pharyngeal cultures, when GC and Chlamydia are suspected):
- RA/JRA
- Viral arthritis
- SLE
- Lyme
- Sarcoid
- Spondyloarthropathy
- Ankylosing Spondylitis
- Reactive Arthritis
- Psoriatic Arthritis
- IBD-Associated Arthritis
- TB arthritis
References
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