No clinically significant increase in COHb was identified by serial testing. Serial COHb levels were not infrequent in this study. The largest increase of these was from 2.0% to 3.9%. Four patients had an increase in COHb level on serial testing. Serial COHb levels were obtained more commonly in burn patients, those admitted to the ICU and those who had HBO2 therapy.

Subsequent serial levels were obtained on average at 353, 663 and 1,095 minutes and averaged 2.8%, 1.8% and 1.1% respectively. A mean of 2.6 (range 2 - 9) serial COHb levels were obtained. The time and change in values between serial levels were also obtained.Ħ24 cases were identified, with 106 (17%) having multiple carboxyhemoglobin levels. Data collected included age, gender, pregnancy status, smoking history, encounter month, admission status, oxygen administration, fire or burn history, vital signs, presenting symptoms, hyperbaric oxygen (HBO2) therapy use, initial pH, troponin, lactate, and COHb levels. We sought to evaluate the trends and characteristics associated with obtaining serial carboxyhemoglobin levels.Ī retrospective review was performed at an academic medical center for all inpatient and emergency department cases with either single COHb or serial COHb levels from 1 April 2010 through 31 March 2015. Serial COHb levels are sometimes obtained despite the well-established half-life of COHb with oxygen supplementation. Carboxyhemoglobin (COHb) levels are obtained when there is suspicion for carbon monoxide (CO) exposure.

Control center serial