Gout may be diagnosed if one of the following criteria is present:
Monosodium urate crystals in synovial fluid
Tophi confirmed with crystal examination
At least six of the following findings:
Asymmetric swelling within a joint on a radiograph
First metatarsophalangeal joint is tender or swollen (i.e., podagra)
Hyperuricemia
Maximal inflammation developed within one day
Monoarthritis attack
More than one acute arthritis attack
Redness observed over joints
Subcortical cysts without erosions on a radiograph
Suspected tophi
Synovial fluid culture negative for organisms during an acute attack
Unilateral first metatarsophalangeal joint attack
Unilateral tarsal joint attack