What is the role of lab testing in the workup of hypersensitivity pneumonitis (HP)?

Updated: Oct 08, 2020
  • Author: Caleb Hsieh, MD, MS; Chief Editor: John J Oppenheimer, MD  more...
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There are no unique diagnostic laboratory tests for the diagnosis of hypersensitivity pneumonitis (HP). Neutrophilia is commonly seen in acute illness. Nonspecific markers of inflammation such as erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP) are also observed in many patients. It should be noted that peripheral blood eosinophilia is often absent. Elevated quantitative serum immunoglobulins have been reported.

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