Repeat examination of synovial fluid for crystals: Is it useful?

From: Clinical Chemistry | Date: September 1, 2003| Author: | Copyright information

To the Editor:

The crystal arthropathies, gout and calcium pyrophosphate dihydrate deposition disease, are caused by deposition of monosodium urate (MSU) or calcium pyrophosphate dihydrate (CPPD) crystals, respectively. A diagnosis of urate gout or calcium pyrophosphate dihydrate deposition disease is based on characteristic clinical findings and the microscopic identification of intracellular crystals in synovial fluid.

Several studies have shown the lack of sensitivity of microscopic examination of synovial fluid for MSU or CPPD crystals [sensitivity, 78% (1) and 79% (2) for MSU and 12% (1) ...

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