A 45-year-old woman with RA on methotrexate and etanercept develops a 2-week productive cough, night sweats, and a 4 kg weight loss. Chest X-ray shows right upper lobe infiltrate with cavitation. What is the most critical first step before continuing biological therapy?

• A Add ciprofloxacin empirically and continue etanercept
• B Switch from etanercept to rituximab which carries lower TB risk
• C Perform IGRA test; if negative, continue etanercept
• D Stop etanercept immediately and investigate for active tuberculosis with sputum AFB smear, CBNAAT/culture, and HRCT chest ✓

Explanation

TNF inhibitors such as etanercept markedly increase risk of tuberculosis reactivation and dissemination; upper lobe cavitation with constitutional symptoms is highly suspicious for active TB. The biological must be stopped immediately, and active TB excluded by sputum smear microscopy, CBNAAT (GeneXpert), culture, and HRCT chest before any therapeutic decision. A negative IGRA alone does not exclude active disease.

Reference: Harrison's Principles of Internal Medicine, 21st ed.

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Written and medically reviewed by the StethoPrep medical team.