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Laboratory: Clinical Biochemistry
Test Name:
Test Code: GWB
Clinical Information:
Only available in rural Manitoba.  Capillary blood and arterial blood glucose values are essentially the same and both are approximately 0.3 mmol/L higher than venous blood glucose values.  Plasma or serum glucose values are about 13% higher than whole blood values.

For WRHA and Westman Lab see Glucose - (P)

State whether the sample is venous or arterial.
Collection Devices:
Specimen Required: Skin puncture: lancet and capillary collection tube (plain, lithium heparin, or balanced heparin for electrolytes and blood gases)
Venipuncture:  lithium or sodium heparin collection tubes and disposable transfer device
(e.g. 1cc syringe and a 16 to 20 gauge needle)
Arterial puncture:  Plain syringe or blood gas syringe with heparin and labeled for the assays performed

Only available at sites which perform iStat testing onsite.
Reference Values:
Venous & Capillary:  3.9 – 5.8 mmol/L
Arterial: 3.9 – 5.8 mmol/L

Cord:                       2.5-5.3 mmol/L
Normal fasting* glycemic control (mmol/L):
0 - 1 d:                     2.2-6.0  
2 d - 4 wk:                2.8-6.0
5 wk - 5 y:                3.3-6.0 
≥ 6 y:                        3.6-6.0
*Patients fasted appropriately according to age
Canadian Diabetes Association Clinical Practice Guidelines:
Impaired fasting glucose:  6.1-6.9 mmol/L
Diabetes mellitus:        Fasting:  ≥ 7.0 mmol/L
                                     Random:  ≥ 11.1 mmol/L

Note:  Reference ranges are specific to the Abbott iStat (POC instrument)
Turn around time (TAT): < 60 minutes
See Also:
More Information:
Substance Concentration Producing Interference         Maximum Expected In Vivo
Bromide 37.5 mmol/L Decrease (-) glucose by 1.7 mmol/L
pH pH: per 0.1 pH units below 7.4 @ 37°C

pH: per 0.1 pH units above 7.4 @ 37°C
Decrease (-) glucose by 0.05 mmol/L
Increase (+) glucose by 0.04 mmol/L
Oxygen PO2 less than 20 mmHg @ 37°C May decrease (-) glucose
Hydroxyurea 100 mmol/L Increase (+) glucose 0.44 mmol/L
Thiocyanate 24 mmol/L Decrease (-) glucose by approx. 23%