What serum urate target is recommended for gout management?

Target serum urate <6.0 mg/dL (360 μmol/L) for most gout patients; <5.0 mg/dL (300 μmol/L) for severe gout (tophi, frequent flares); Treat-to-target approach: titrate ULT until sUA is below target.

How should allopurinol be titrated safely?

Start allopurinol 100 mg/day (50 mg/day if CrCl <30 mL/min); increase by 50-100 mg every 2-4 weeks to achieve sUA target; maximum 800-900 mg/day; HLA-B*5801 testing before starting in high-risk populations (Han Chinese, Thai, Korean - severe SJS/TEN risk).

What is the evidence for flare prophylaxis during ULT initiation?

Colchicine 0.5-1 mg daily or naproxen 250 mg BID for 3-6 months during ULT initiation prevents mobilization flares; AGREE trial: colchicine prophylaxis reduces flares 85% during allopurinol dose escalation; do not start ULT during acute flare.

When should febuxostat be used instead of allopurinol?

Febuxostat 40-80 mg/day is indicated for allopurinol intolerance or failure to achieve sUA target; CARES trial: elevated cardiovascular death with febuxostat vs allopurinol; FDA black box warning - febuxostat reserved for allopurinol failures.

What is the 2015 ACR/EULAR gout classification criteria?

Crystal identification is not always available; clinical scoring ≥8 has 92% sensitivity, 89% specificity; domains: joint pattern, symptom characteristics, time course (typical rapid onset/resolution), clinical signs (tophi, redness), laboratory (hyperuricemia, urate crystals), imaging (double contour sign on US, MSU deposits on DECT).

Gout Flare Diagnostic Scoring and Urate-Lowering Therapy Target

Applies the Janssen (2010) gout diagnosis scoring system for probability of acute gout without joint aspiration, calculates urate-lowering therapy dose for serum urate <6.0 mg/dL target, and evaluates prophylaxis adequacy.

Weight

Height

Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.

How to Use

Enter the values for the patient or scenario you are assessing. Applies the Janssen (2010) gout diagnosis scoring system for probability of acute gout without joint aspiration, calculates urate-lowering therapy dose for serum urate <6.0 mg/dL target, and evaluates prophylaxis adequacy. Use the gout flare score result to inform your clinical assessment.

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