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Glucose - Blood

Source Blood
Mnemonic GLUF (Prompt: enter hours fasting)
GLU2H
GLU
Specimen Requirements 1 x 3 mL or 4.5 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

0.2 mL heparinized plasma or serum

Minimum Whole Blood Volumes for Micro-Collections using Microtainers

Fasting Glucose requires a fast of at least 8 hours.


CLS Staff:
For fasting glucose, if patient is not fasting (or has not been fasting for 8 hours):
  • PSC and Outpatients: order GLUF and collect the specimen. Enter hours fasting into the LIS. Note: this does not apply to Glucose Tolerance Test, in which a fasting specimen is required.
  • Inpatients: consult with nursing unit.
Specimen Handling Record time of collection and hours p.c. on requisition and on specimen tube.

MUST be centrifuged within 2 hours of collection to ensure accurate results.
Additional Information For Diabetes Clinical Practice Guidelines, please see Canadian Diabetes Assn. 2008 C.P.G.

Testing Location Chemistry-All Sites
Testing Frequency Daily
Alternate Name(s) FBS (Fasting Blood Sugar)
Reference Interval

 Fasting

1 – 30 days

2.4-5.6 mmol/L

1 month – 150 years

3.9-6.1 mmol/L

 

Random and 2 hr p.c.
3.6 - 11.1 mmol/L

Click here for critical values.