Skip to content

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Find out more here. Hide this message

Laboratory Medicine

Test Directory / Carbon Monoxyhaemoglobin

Carbon Monoxyhaemoglobin


TestCarbon Monoxyhaemoglobin
Common AbbreviationsCO, COHb, Carbon Monoxide
Tube typeEDTA
Clinical IndicationInvestigation of suspected carbon monxide poisioning
Specimen TypeBlood
Sample typeEDTA plasma
Minimum Volume0.5 mL
Special PrecautionsSample analysis at the laboratory is only available during nomal working hours (9am-5pm Monday-Friday).
Stability4 weeks at 2-8°C and 20-25oC (full, sealed tube)
Turnaround Time24 hours
LaboratoryYork and Scarborough
Reference IntervalNon-smokers: 0.0-1.5%, Smokers: 1.5-5.0%
LimitationsBlood Carbon Monoxyhaemoglobin levels are NOT a sensitive indicator of carbon monoxide exposure, as the high concentrations of oxygen in the atmosphere can cause blood levels to decrease once a patient is removed from the immediate source of cabon monoxide. The use of a home-carbon monoxide meter is recommended as an alternative means of assessing carbon monoxide exposure. Patients with suspected severe toxicity or a clear history of exposure should be referred to the Emergency Department for assessment, as point of care analysis is available to inpatients 24h a day.
Looking down a long bright hospital corridor with treatment rooms on the left and windows on the right. At the bottom of the corridor is one member of staff in a blue nursing uniform

Our Hospitals

Logo on blue with swoosh


Chinese Poland

View all languages >