Abbrev Code:GLU   
Order Code:LAB3502Order Name:Glucose
Order Instructions:UMMC: For stat/conditional newborn recheck of critically LOW glucose by meter, order GLUCW and collect in capillary tube.
Synonyms:BS; Two Hour Postprandial
Methodology:Bichromatic endpoint
St Johns/St Joseph/ Woodwinds: Hemokinase
CPT Codes: 82947 x1
Turnaround Time:Performed and reported 24 hours/day.
Special Instructions:Glucose will decrease 5 -10 mg/dL/hour in an unprocessed tube as a result of glycolysis. Collection in a gray top (NaF + K-oxalate) tube will halt glycolysis after 2 hours and preserve the glucose level for 24 hours.

Collection Instructions

Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Container:Green (lithium heparin, gel), St Johns/St Joseph/Woodwinds-Green (lithium heparin, no gel)
Alternate Containers: Green (lithium heparin, no gel), Red (no gel), Red or gold (gel), St Johns/St Joseph/Woodwinds - Red (no gel)
Patient Preparation:Please do not eat 10-12 hours before your appointment if you are coming in fasting for labs on lipids, cholesterol or glucose (sugar). This does not apply to pregnant women.
Water, tea or black coffee (with nothing added) is okay. Do not drink other fluids, diet soda or chew gum.
If you have concerns about taking your medications, please send a message by clicking on Secure Messaging, Message Your Care Team.
Causes for Rejection:Specimen not separated from cells within 2 hours of collection (4 hours for Home Health specimens). Gray top tube not received within 24 hours of collection.

Processing and Shipping

Specimen Processing:Process within 2 hours (4 hours for Home Health specimens). Centrifuge and aliquot 1.25 mL, 0.2 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Stability:Stability: Once separated from cells, Room temperature - 8 hours; refrigerated - 72 hours.
Test Performed at or Referral Lab Chemistry  (M Health Maple Grove Clinic, Range, UMMC-East Bank, Oxboro Bloom, Lakes, Ridges, Northland, Southdale, UMMC/UMMCH-West Bank, Clinics, M Health Clinic and Surgery Center, Grand Itasca, St. Joseph's, St. John's, Woodwinds)


Critical Range:Basic, Electrolyte and Renal Panels Critical Values and Reference Ranges
Reference Range:Basic, Electrolyte and Renal Panels Critical Values and Reference Ranges

While either a fasting glucose or oral glucose tolerance test (OGTT) can be used to diagnose pre-diabetes or diabetes, the ADA recommends the fasting glucose because it is easier, faster and less expen­sive to perform.

A fasting glucose level between 100 and 125 mg/dL signals pre-diabetes or impaired fasting glucose (IFG). A patient with a fasting glucose level of 126 mg/dL or higher has diabetes.

A two-hour glucose level between 140 and 199 mg/dL on the OGTT signals pre-diabetes or impaired glucose tolerance (IGT). If the two-hour glucose level is 200 mg/dL or higher, the patient has diabetes.

Patients with IFG and/or IGT now are referred to as having “pre-dia­betes,” indicating their relatively high risk for developing diabetes.

For more information, see
















200 mg/dL





199 mg/dL


140 mg/dL





126 mg/dL


139 mg/dL




125 mg/dL


100 mg/dL





99 mg/dL

























Diagnostic Ranges





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