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Diagnosing HIV-associated tuberculosis: reducing costs and diagnostic delay
C P Hudson1, R Wood, G Maartens
1Department of Medicine, University of Cape Town, South Africa.
Summary
Diagnosing tuberculosis in HIV patients can be streamlined. Repeated sputum smear tests offer high yield, and using lymph node aspirates and early biopsies can reduce costs and delays.
Area of Science:
- Infectious Diseases
- Public Health
- Clinical Diagnostics
Background:
- Tuberculosis (TB) diagnosis in Human Immunodeficiency Virus (HIV) co-infected patients presents unique challenges.
- Optimizing diagnostic strategies is crucial for timely treatment and improved patient outcomes.
Purpose of the Study:
- To evaluate the diagnostic yield and laboratory costs of various procedures for HIV-associated TB.
- To assess the time to diagnosis and identify factors contributing to delays.
Main Methods:
- A retrospective cohort study was conducted at a university-affiliated hospital in South Africa.
- Data were collected on adult HIV-infected patients with newly diagnosed TB over a two-year period.
Main Results:
- Sputum smear microscopy had a 43% overall yield, correlating with chest radiograph findings but not CD4+ counts.
- Sputum smear-negative TB patients experienced significant diagnostic delays; lymph node biopsy and aspirates were cost-effective.
- Over-reliance on cultures led to unnecessary expenditure.
Conclusions:
- Repeated sputum smear examination is effective for diagnosing HIV-associated TB.
- A streamlined approach using lymph node aspirates and early biopsies could significantly reduce laboratory costs and hospital stays.