Test Code LAB213 Crystals, Synovial Fluid
Useful For
Identifying the presence and type of crystals in synovial fluid. Monosodium urate crystals are found in almost 100% of fluids from acute gouty joints (within phagocytes), and less frequently in chronic gouty joints (mostly extracellular). Calcium pyrophosphate dihydrate (CPPD) crystals are characteristic of pseudogout chondrocalcinosis and CPPD deposition disease. Clinical symptoms mimic gout, rheumatoid arthritis, or osteoarthritis. Diagnosis requires demonstrating CPPD crystals.
Methodology
Compensated Polarized Light Microscopy
Performing Laboratory
Bozeman Health Laboratory Services
Specimen Requirements
Specimen Type: Synovial Fluid
Container/Tube: Dark-green top (sodium heparin)
Specimen Volume: 3 mL
Additional Information: Indicate specimen source.
Specimen Rejection: Lavender top (EDTA) tube or light-green top (lithium heparin) tube
Specimen Transport Temperature
Ambient
Specimen Stability
Specimen Type | Temperature | Time |
---|---|---|
Synovial Fluid | Ambient (preferred) | 72 hours |
Refrigerated |
Note: Body fluids should be examined expeditiously. If they must be stored, store refrigerated.
Reference Values
No crystals seen
If present, crystals are identified.
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
89060