What is the role of lab testing in the evaluation of chronic obstructive pulmonary disease (COPD)?

Updated: Nov 13, 2020
  • Author: Paul Kleinschmidt, MD; Chief Editor: Barry E Brenner, MD, PhD, FACEP  more...
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Arterial blood gas (ABG) analysis provides the best clues as to acuteness and severity. In general, renal compensation occurs even in chronic CO2 retainers (ie, bronchitics); thus, pH usually is near normal. Generally, consider any pH below 7.3 a sign of acute respiratory compromise.

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