Pneumonia laboratory findings

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

Laboratory Tests

Routine Tests

Findings in routine blood tests are based on the severity of the disease and the cause, they can include the following:

• Leukocytosis or leukopenia
• Eosinophilia (in cases of eosinophilic pneumonia)
• Anemia
• Hyponatremia
• Thrombocytopenia
• Elevated BUN
• Findings of lactic acidosis (decreased HCO3, increased lactic acid levels)

Other Laboratory Tests

Urine Antigen Test

• Used to diagnose Legionella disease.
• The presence of the antigen in urine can be detected in 24 hours since the onset of the symptoms
• The severity of Legionella disease increases the sensitivity of the urinary antigen test.