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Chronic extrinsic allergic alveolitis - investigations

Authoring team

The investigation of chronic extrinsic allergic alveolitis should include:

  • serology demonstrates serum precipitins
  • chest radiography demonstrates fibrosis, seen as predominantly upper-lobe shadowing
  • lung function tests show reduced volume and transfer factor with a normal FEV1/FVC ratio
  • bronchoalveolar lavage shows a predominance of lymphocytes and mast cells
  • provocation test with suspected antigen if the history is unclear
  • transbronchial or open lung biopsy if the diagnosis is in doubt

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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