Laboratory Test Information Guide

Details for Co oximetry

Test Name: Co oximetry
Alternate Name(s): Methemoglobin
METHB
Carboxyhemoglobin
COHB
Carbon Monoxide
COOX
Laboratory: Core (all sites)
Specimen Type: Heparinized blood gas syringe or 4.5 mL Green (Lithium Heparin) top vacutainer tube.
Collection Information: Pediatric (whole bood)
Samples need to be collected in a 1 mL heparinized syringe.

Capillary blood gas collection tubes and Lavender (EDTA) top tubes are NOT acceptable

Labeling:
Put small Cerner label on syringe and place in biohazard bag with large Cerner label in the outside pocket of the biohazard bag.

Transport:
Send to the lab immediately
Do NOT freeze.
Do NOT centrifuge
Requisition: GENERAL LABORATORY REQUISITION
Test Schedule: As required
Turnaround time from when specimen
is received in testing laboratory:
 
Routine
4 hours
Stat
30 minutes
 
Reference Range: 
Whole Blood, AdultAge RangeMaleFemale
Hemoglobin, Hbbirth-1 month150-250150-250
1 month-2 years100-140100-140
2 years-10 years110-160110-160
10 years-18 years125-160120-150
18 years-adult135-170115-160
Oxygenated Hemoglobin; O2Hb(all)95-9895-98
CarboxyHemoglobin; COHbNon-smoker, all<1.5<1.5
Smokers all:
1-2 packs/day1.5-5.01.5-5.0
>2 packs/day5.0-9.05.0-9.0
MetHemoglobin: MetHb(all)0.4-1.20.4-1.2
Deoxygenated Hemoglobin (HHb)(all)0-50-5
Hematocrit, calculated(all)0.37-0.480.34-0.48


Carboxy Hemoglobin; COHb
Toxic: >20%
Lethal: >50%

Hb (g/L)
Critical Low: 70
Critical High: 200
Effective Date: 2016-05-04
Revised Date: 2016-05-04
Critical Value: See Reference Range
Interpretive Comments:  
Special Processing:  
Comments:  
Method of Analysis: GEM Premier 4000 Blood Gas Analyzer
Optical Measurement following chemical lysing and mixing of the whole blood sample: Cooximetry for Hemoglobin, Methemoglobin, Carboxyhemoglobin, Oxyhemoglobin and Deoxyhemoglobin

Please note that the measured %saturation (sO2) overestimates oxygenation status in the presence of dyshemoglobins (carboxyHb & metHb) and may result greater than 100%.
Critical Information Required:  
Storage & Shipment:  Send to the lab immediately
Do NOT freeze.
Do NOT centrifuge
System Codes: 
Cerner
COOX
 
Referred To:  

Questions? Comments? Contact Laura Gopaul