How are lab and radiographic findings scored in the pneumonia severity index (PSI) for bacterial pneumonia?

Updated: Sep 30, 2020
  • Author: Justina Gamache, MD; Chief Editor: Guy W Soo Hoo, MD, MPH  more...
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Answer

Laboratory and radiographic findings are scored as follows:

  • Arterial pH less than 7.35 – Add 30 points

  • BUN value of 30 mg/dL or greater – Add 20 points

  • Sodium level less than 130 mmol/L – Add 20 points

  • Glucose level of 250 mg/dL or greater – Add 10 points

  • Hematocrit value less than 30% – Add 10 points

  • Partial arterial pressure (PaO2) less than 60 mm Hg or peripheral oxygen saturation (SpO2) less than 90% while breathing room air – Add 10 points

  • Pleural effusion – Add 10 points


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