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Test ID CRSBF Crystal Identification, Body Fluid

Specimen Required


Preferred: Lavender top (EDTA)

Acceptable: Green top (heparin)

Specimen Volume: 2 mL

Useful For

Identifying the presence and type of crystals in synovial fluid

Method Name

Compensated Polarized Light Microscopy

Reporting Name

Crystal ID, BF

Specimen Type

Body Fluid

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Body Fluid Refrigerated (preferred)
  Ambient  24 hours

Reference Values

None seen

If present, crystals are identified.

Day(s) Performed

Monday through Sunday

Report Available

1 day

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
CRSBF Crystal ID, BF 6825-4


Result ID Test Result Name Result LOINC Value
CRYFT Fluid Type 14725-6
CRYID Crystal ID 6825-4
CRYCM Comment 77202-0