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Case Reports
. 2007 Aug;33(2):131-2.
doi: 10.1016/j.jemermed.2006.11.016. Epub 2007 Jun 5.

Mind the gap

Jawaid Akhtar  1 , Bradford D Johnston, Edward P Krenzelok
Affiliations
Case Reports

Mind the gap

Jawaid Akhtar et al. J Emerg Med. 2007 Aug.

Abstract

The "oxygen saturation gap" is the difference between the calculated oxygen saturation from a standard blood gas machine and the reading from a pulse oximeter. If it is greater than 5%, the patient's hemoglobin may be abnormal, representing carbon monoxide poisoning, methemoglobinemia, or sulfhemoglobinemia. We report a case where awareness of the saturation gap led to the diagnosis of carbon monoxide poisoning.

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