A urine Lateral Flow Assay (LFA) for Cryptococcal antigen (CrAg) in a newly diagnosed HIV patient (CD4 8 cells/µL) is reactive at 1:160 dilution. The patient is asymptomatic with no meningism. What is the WHO recommended management?
- A Start ART immediately without further workup
- B Lumbar puncture to exclude subclinical meningitis; if CSF negative, give fluconazole 800 mg/day for 2 weeks pre-emptive therapy before starting ART ✓
- C Treat as confirmed cryptococcal meningitis with amphotericin B + flucytosine without LP
- D Repeat urine CrAg in 2 weeks — single reactive result insufficient
Explanation
WHO 2022 guidelines recommend that all newly diagnosed HIV patients with CD4 <100 cells/µL be screened with CrAg LFA (urine or blood). A reactive CrAg requires lumbar puncture to rule out subclinical cryptococcal meningitis before starting ART (because ART-associated immune reconstitution can precipitate IRIS-cryptococcal meningitis if occult meningitis is present). If CSF CrAg is negative (i.e., no meningitis), pre-emptive oral fluconazole 800 mg/day for 2 weeks then 400 mg/day for 8 weeks is given to prevent development of meningitis. ART is delayed for 4–6 weeks in confirmed cryptococcal meningitis to reduce IRIS risk.
Reference: Ananthanarayan & Paniker's Textbook of Microbiology, 11th ed.
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