Sunquest Code:GLU  
Epic Code:LAB3502Epic 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 end point
CPT Code:----------CPTCODES HERE----------
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) (Green (lithium heparin) on ICE, Green (sodium heparin, no gel), Green (sodium heparin, no gel) on ICE, Red (no gel), Red or gold (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  (University of Minnesota Health Maple Grove Clinics, Fairview Range - FRMC, UMMC-East Bank, Oxboro Bloom, BurnsRidges, Fairview Lakes - FLMC, Fairview Ridges - FRH, Fairview Northland - FNMC, Fairview Southdale - FSH, UMMC/UMMCH-West Bank, Fairview Clinics, M Health Clinic and Surgery Center, Grand Itasca GICH)


Critical Range:
Age mg/dL
0 - 71 h Less than 40 or greater than 200 mg/dL
3 d - 5 mo Less than 51 or greater than 200 mg/dL
6 mo and older Less than 51 or greater than 500 mg/dL
 GICH: All ages - Less than 40 and greater than 500 mg/dL  
Reference Range:
Fasting glucose is defined as no caloric intake for 8 hours. Casual glucose is defined as any time of day without regard to time since last meal. Casual glucose range is dependent upon food intake, intravenous fluids and parenteral nutrition.  
Age Fasting Casual
0 - 47 h 40-99 mg/dL 50-139 mg/dL
48 h - 5 mo 51-99 mg/dL 51-139 mg/dL
6 mo and older 70-99 mg/dL 70-139 mg/dL
GICH: All ages 70-105 mg/dL
A fasting glucose greater than 126 mg/dL or a casual plasma glucose greater than 200 mg/dL if confirmed on a subsequent day, meets the threshold for the diagnosis of diabetes, and precludes the need for a glucose challenge.

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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