American College of Rheumatology (ACR) 1977 criteria for the diagnosis of acute gout:
- The presence of urate crystals in joint fluid
- A tophus containing urate crystals
- Fulfillment of 6 or more of the criteria in Table 1.
Reprinted from Arthritis and Rheumatism (Wallace SL, et al. Preliminary criteria for the classification of the acute arthritis of primary gout. Arthritis Rheum 1977; 20:895–900), copyright 1977, with permission of Wiley-Liss, Inc., a subsidiary of John Wiley & Sons, Inc.