Gout Diagnosis Criteria

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ACR/EULAR 2015 classification system for gout.

Clinical Findings

Joint Involvement

Episode Features

Erythema over affected jointCannot bear weight or touch jointRapid onset (max pain < 24h)Evidence of tophus

Labs & Imaging

Serum Urate Level (mg/dL)

Imaging (Ultrasound 'Double Contour' or DECT)

Diagnosis Assessment

Classification Score0pts

ClassificationUnlikelythreshold 8

Patient does not meet classification criteria.

Based on 2015 ACR/EULAR Gout Classification

Other forms of arthritis (Pseudogout, Rheumatoid, Septic) can mimic gout flares. Clinical correlation is required.

About this calculator

Overview

The ACR/EULAR classification criteria provide a standardized method for diagnosing gout. It uses a combination of clinical symptoms, laboratory findings (like serum urate), and imaging evidence. A score of 8 or more is used to classify a patient as having gout.

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Pro Tips

A 'tophus' is a large, chalky deposit of urate crystals, often found on ears or joints.
Serum urate should ideally be checked at least 4 weeks after a flare has resolved for baseline accuracy.
Imaging like DECT (Dual-Energy CT) can detect urate deposits deeply within tissues.

Fun Facts

"Presence of MSU (monosodium urate) crystals in synovial fluid is a standalone diagnosis (gold standard)."
"The first metatarsophalangeal (MTP1) joint is the most common site for initial gout attacks."
"Serum urate levels can sometimes be normal during an acute flare."
"Total score ranges from -2 to 23."

Formula: Points are assigned across Clinical, Laboratory, and Imaging categories.