What is the specificity and sensitivity of sputum induction in the workup of Pneumocystis jiroveci pneumonia (PJP)?

Updated: Apr 24, 2019
  • Author: Shelley A Gilroy, MD, FACP, FIDSA; Chief Editor: Pranatharthi Haran Chandrasekar, MBBS, MD  more...
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The sensitivity of sputum induction varies widely (< 50% to >90%) and depends on proficiency in using the technique and the experience of the laboratory. Specificity is high (99%-100%). This study may be less sensitive in patients without HIV infection, as the immunodeficiency caused by HIV infection typically leads to a greater alveolar load of Pneumocystis organisms. It may also be less sensitive in patients receiving aerosolized pentamidine for prophylaxis.

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