Lab Test

Glucose, Whole Blood

Blood Sugar

Test Codes



  • Glucose, Whole Blood should ONLY be collected at the Royal Oak or Troy Hospital Campuses. Specimens should not be collected at any other Beaumont Laboratory drawsite, nursing home, or Outreach office.
  • This test can be performed as either a fasting or random blood sugar.

Specimen Collection Criteria

Collect: One Dark Green-top Lithium Heparin tube. (Minimum Whole Blood: 1.0 mL)

Transport specimen STAT to the Laboratory after collection. 

Rejection Criteria

Specimen in which significant delays occur before arrival in the Laboratory (greater than 2 hours).

Inpatient Specimen Preparation

Transport the specimen STAT to the STAT Laboratory (Royal Oak) or Chemistry Laboratory (Troy).

In-Lab Processing

Immediately analyze the whole blood specimen upon receipt in the Laboratory.


Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 2 hours
Refrigerated (2-8°C or 36-46°F): Unacceptable
Frozen (-20°C/-4°F or below): Unacceptable

Specimen Storage in Department Prior to Disposal:

Specimens are disposed within 8 hours of testing.


Farmington Hills Chemistry Laboratory
Royal Oak STAT Laboratory
Troy Chemistry Laboratory


Sunday – Saturday, 24 hours a day.
Results available within 30 minutes of receipt in the Laboratory.

Reference Range

Fasting: 60-99 mg/dL.
Random: 60-139 mg/dL.

Test Methodology

Enzymatic amperometry. 


See Glucose assay.

Clinical Utility

  • This assay is appropriate when rapid turn around time is important for patient management.
  • If serum or heparinized plasma is left in contact with blood cells for extended periods, glucose will be metabolized. Glucose levels decrease by about 5-7 mg/dl per hour at room temperature in normal specimens containing normal numbers of RBC's and WBC's.

CPT Codes



Last Updated


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This directory currently reflects information only for specimens collected and/or processed at the
Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.