Sign in →

Test Code JOINT CRYS Crystals, Fluid

Clinical System Name

Crystals, Fluid


Synovial Fluid Crystals

Joint Fluid For Crystals

Sample Requirements

Specimen:  Body Fluid

Container(s): Dark Green/Sodium Heparin (Synovial, Pericardial, Peritoneal, Pleural Fluids)

                      Specimen cup, Syringe, or Plain tube acceptable for other body fluids

Preferred Vol: 1.0-5.0 mL

Minimum Vol: 0.50 mL body fluid


Note: Lavender/EDTA and Lithium Heparin tubes may produce crystalline structures resembling monosodium urate in synovial fluid and are not recommended for crystal analysis. Note body fluid type on requisition and container. Send to the lab immediately (within 1 hour) for accurate results.

Processing Instructions

Reject due to: Age of Specimen, Clotted Solid, incorrect specimen container

Spin: N

Aliquot: N

Temp: RT

Storage location: Deliver to Core lab Hematology bench with copy of requistion.


Off-site collection: Refrigerate Body Fluid at 2-8oC. Crystal examination only, no cell counts.



Specimen Type Temperature Time
Body Fluid RT

 2 d



 2 d




 * It is recommended that body fluids be examined within an hour of collection, cell counts affected.



STAT Performed TAT
Y 24/7 2 h


Performing Laboratory

Seattle Children's Laboratory    


Department:  Core Hematology

Phone Number206-987-2617


Reference Range

Reference ranges are not available for BF.


Method:  Polarized light field microscopy

Analytical Volume:  100 ul body fluid

CPT Codes