https://wikem.org/w/index.php?action=history&feed=atom&title=Carboxyhemoglobin 2026-04-18T05:12:09Z Revision history for this page on the wiki MediaWiki 1.38.2 https://wikem.org/w/index.php?title=Carboxyhemoglobin&diff=388779&oldid=prev 2026-03-22T06:58:14Z

<p>Create lab page for Carboxyhemoglobin with EM-focused content and references</p> <p><b>New page</b></p><div>==Background==<br /> *Hemoglobin bound to carbon monoxide (CO); measured on co-oximetry (ABG)<br /> *Pulse oximetry cannot distinguish COHb from oxyhemoglobin and may read falsely normal<br /> <br /> ==Normal Values==<br /> *Non-smoker: &lt;3%<br /> *Smoker: &lt;10%<br /> <br /> ==Interpretation==<br /> *Symptoms correlate poorly with levels but generally: headache &gt;10%, confusion &gt;20%, seizures/coma &gt;40%, death &gt;60%<br /> *Check in all patients with headache, AMS, or syncope in the setting of possible CO exposure (house fires, heaters, enclosed space)<br /> *Co-oximetry on ABG is the only reliable measurement; standard pulse oximetry is unreliable<br /> *Treat with 100% FiO2 via NRB; consider hyperbaric oxygen for levels &gt;25%, loss of consciousness, cardiac ischemia, or pregnancy&lt;ref&gt;Weaver LK, et al. Hyperbaric oxygen for acute carbon monoxide poisoning. N Engl J Med. 2002; 347(14):1057-1067. PMID 12362006.&lt;/ref&gt;<br /> *Half-life of COHb: ~5 hours on room air, ~90 min on 100% O2, ~30 min with hyperbaric O2<br /> <br /> ==See Also==<br /> *[[Carbon monoxide poisoning]]<br /> *[[Smoke inhalation]]<br /> <br /> ==References==<br /> &lt;references/&gt;<br /> <br /> [[Category:Labs]]</div>

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