Singapore General Hospital will NEVER ask you to transfer money over a call. If in doubt, call the 24/7 ScamShield helpline at 1799, or visit the ScamShield website at www.scamshield.gov.sg.

Help Us Improve Your Experience:

We’d love to hear from you! Rate the SGH website and share your feedback so we can enhance your online experience and serve you better. Click here to rate us

CARBOXYHAEMOGLOBIN, BLOOD

Synonym(s):
Lab Section Category
View write-up
Specimen Required

​3 mL blood in heparinised sealed syringe immersed in crushed ice.

Storage/Transport

​Keep cold with ice and send immediately to the laboratory.

Method

​Co-oximetry

Reference Interval / Value

​From 0 day
Non-smokers: <1.5 % total Hb

Smokers (1-2 packs/day): 1.5 - 4.9 %

Heavy smokers (>2 packs/day): 5.0 - 9.0 %

Toxic: >20 %

Turnaround Time

​Mean = 4 hrs, Range: 3 – 5 hrs

Day(s) Test Set up

​Daily, 24-h STAT

Change History Notes

  • 03 Apr 2020 04:10 PM

    Storage and Transport is updated on 03 Apr 2020.

Back: Pathology Laboratory Services

Last Updated - 13 Jun 2025