Reactive Arthritis Severity and Chronicity Risk Assessment

Assesses reactive arthritis severity, likelihood of chronicity (HLA-B27, causative organism, joint count), and antibiotic selection for trigger organism eradication including Chlamydial reactive arthritis.

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.
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How to Use

Enter the values for the scenario you are assessing. Assesses reactive arthritis severity, likelihood of chronicity (HLA-B27, causative organism, joint count), and antibiotic selection for trigger organism eradication including Chlamydial reactive arthritis. Use the reactive arthritis score result to inform your calculation.

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Frequently Asked Questions