Laboratory Tests

• The peripheral WBC count may be only mildly elevated.

• The serum uric acid level often is elevated but may be normal during an acute attack.

• Other laboratory markers of inflammation (e.g., increased erythrocyte sedimentation rate) are often present.

FIGURE 59-1. Synovial fluid containing extracellular and intracellular monosodium urate crystals. (From Schumacher HR, Chen LX. Gout and other crystal arthropathies. In: Fauci AS, Braunwald E, Kasper DL, et al., eds. Harrison's Principles of Internal Medicine, 17th ed. New York: McGraw-Hill; 2008, Fig. 327-1, page 2166, with permission.)

FIGURE 59-1. Synovial fluid containing extracellular and intracellular monosodium urate crystals. (From Schumacher HR, Chen LX. Gout and other crystal arthropathies. In: Fauci AS, Braunwald E, Kasper DL, et al., eds. Harrison's Principles of Internal Medicine, 17th ed. New York: McGraw-Hill; 2008, Fig. 327-1, page 2166, with permission.)

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