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Further investigations

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Further investigations in cystic fibrosis include:

  • sputum culture
  • skin test for aspergillus as 20% develop allergic bronchopulmonary aspergillosis
  • chest radiography
  • pulmonary function tests:
    • there may be an obstructive defect causing a reduction in FEV1 and FVC
    • the FEV1/FVC ratio is reduced
    • FEF 25 – 75%
  • in severe cases arterial blood gas sampling shows chronic hypoxia and hypercapnia
  • glucose tolerance test
  • malabsorption screen.

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