American College of Rheumatology Diagnostic Criteria for Gout

Presence of characteristic urate crystals in the joint fluid or

Presence of a tophus proven to contain urate crystals by chemical means or polarized light microscopy or

Presence of six or more of the following clinical, laboratory, or radiologic findings:

 - Asymmetric swelling within a joint on radiography

 - Attack of monoarticular arthritis

 - Culture of joint fluid negative for microorganisms during attack of joint inflammation

 - Development of maximal inflammation within one day

 - Hyperuricemia

 - Joint redness

 - More than one attack of acute arthritis

 - Pain or redness in the first metatarsophalangeal joint

 - Subcortical cyst without erosions on radiography

 - Suspected tophus

 - Unilateral attack involving first metatarsophalangeal joint

 - Unilateral attack involving tarsal joint

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