Crystal Identification, Synovial Fluid
Method Description Describes how the test is performed and provides a method-specific reference
Synovial fluid is anticoagulated with heparin or EDTA (not oxalate because calcium oxalate crystals form). The specimen is examined with a polarizing microscope with and without a first-order red compensator. Cholesterol crystals appear as bright, square or rectangular plates. Pyrophosphate crystals, rhomboidal, are weakly birefringent. Urate crystals are mainly needle-shaped and strongly doubly refractile; they may be found within leukocytes.(Phelps P, Steele AD, MacCarty DJ Jr: Compensated polarized light microscopy. Identification of crystals in synovial fluids from gout and pseudo gout. JAMA 1968;203:508-512)
PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information
Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.
Monday through Sunday; Continuously