Hemoptysis laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sadaf Sharfaei M.D.[2]

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 might show:
      • Hypoxia (normal PaO2 )
    • Blood urea nitrogen might be elevated (normal BUN 8 to 20 mg/dL)
    • Creatinine might be elevated (normal Cr 0.5 to 1.0 mg/dL for women and 0.7 to 1.2 mg/dL for men)
    • Complete blood count (CBC) might show:
      • Elevated WBC (normal WBC )
      • Low platelet (normal Plt )
      • Anemia (normal Hb )
    • Coagulation studies might show:
      • Elevated prothrombin time (normal PT )
      • Elevated partial thromboplastin time (normal PTT )
    • Urinalysis might show:
      • Hematuria (normal RBC in urine <5)
    • Electrolytes
      • Elevated potassium (normal K )