Diagnosing Gout in Obese Patients

Clinical Diagnosis Approach

The European League Against Rheumatism recommends considering gout in the diagnosis of any acute arthritis in an adult, particularly when synovial fluid analysis is not feasible 1
A clinical diagnosis of gout is supported by highly suggestive features, including monoarticular involvement of a foot or ankle joint, previous similar acute arthritis episodes, rapid onset of severe pain and swelling, erythema over the affected joint, male gender, associated cardiovascular diseases, and presence of hyperuricemia, as suggested by the American College of Rheumatology 1

The American College of Physicians suggests that several clinical algorithms have demonstrated sensitivities and specificities greater than 80% for diagnosing gout compared to the gold standard of synovial fluid analysis, with a strength of evidence rated as moderate 4
These algorithms are particularly useful in patients with recent-onset gout who are commonly seen in primary, urgent, or emergency care settings, according to the American Academy of Family Physicians 4

The American College of Radiology recommends ultrasound as the preferred initial imaging modality, showing sensitivities ranging from 37% to 100% and specificities from 68% to 97%, with a strength of evidence rated as high 5
The "double contour sign" has a pooled sensitivity of 74% and specificity of 88%, as reported by the European League Against Rheumatism 5

The American Association for Clinical Chemistry states that serum uric acid measurement is essential but not diagnostic on its own, with many patients with hyperuricemia never developing gout, and some patients with acute gout may have normal serum uric acid levels during an attack 6

The Obesity Society notes that obesity is both a risk factor for gout and can make joint aspiration technically challenging, and recommends systematically assessing for associated comorbidities including hypertension, diabetes, dyslipidemia, and cardiovascular disease 6

The American College of Rheumatology advises against relying solely on serum uric acid for diagnosis, as it may be normal during acute attacks, and recommends considering septic arthritis in the differential diagnosis, with a strength of evidence rated as high 4