Hemoptysis laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Laboratory Findings

• There are laboratory tests that are helpful for diagnosis the underlying cause of hemoptysis.
  • Sputum analysis provides valuable information about the cause of hemoptysis. Sputum must be evaluated for the followings:
    • Cytology
    • Gram stain
    • Culture
    • Acid-fast stain
  • Laboratory tests that might be abnormal in a patient with hemoptysis:
    • Arterial blood gases
    • Blood urea nitrogen
    • Creatinine
    • Complete blood count (CBC)
    • Prothrombin time/partial thromboplastin time (PT / PTT)
    • Urinalysis
    • Electrolytes