Which lab tests are useful for classifying illness severity and admission decisions in bacterial pneumonia?

Updated: Sep 30, 2020
  • Author: Justina Gamache, MD; Chief Editor: Guy W Soo Hoo, MD, MPH  more...
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The following laboratory tests may not be useful for diagnostic purposes but are useful for classifying illness severity and site-of-care/admission decisions [38, 44, 56, 57] (see Risk Stratification under Clinical Presentation):

  • Serum chemistry panel (sodium, potassium, bicarbonate, blood urea nitrogen [BUN], creatinine, glucose)

  • Arterial blood gas (ABG) determination (serum pH, arterial oxygen saturation, arterial partial pressure of oxygen and carbon dioxide) – Hypoxia and respiratory acidosis may be present.

  • Venous blood gas determination (central venous oxygen saturation)

  • Complete blood cell (CBC) count with differential

  • Serum free cortisol value

  • Serum lactate level

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