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Test Code GLUF Glucose Level Fasting

Additional Codes

Cerner

NextGen

Glucose Level Fasting

Glucose Level Fasting

Methodology

Colorimetric (reflectance spectrophotometry) using Glucose Oxidase.

Patient Preparation

8 hour fasting: Tests Requiring Fasting and Fasting Instructions

Collection Instructions

Standard phlebotomy practices.

Specimen Requirements

Container

Specimen Type

Tube

Lithium Heparin Plasma

PST

 or  or 

Serum

 or 

SST

 or  or 

 

Stability

Storage

Temperature

Stability

Room Temperature

18-28°C

≤ 24 Hours

Refrigerated

 2-8°C

≤ 7 days

Frozen

≤-18 °C

≤ 1 year

Rejection Criteria

Gross Hemolysis

Result Reporting and Reference Values

Reported in mg/dL.

Age

Low

High

Critical Low

Critical High

0-2days

40

90

40

300

2days-30days

60

99

40

300

30days-18 years

60

99

50

500

18 years-150 years

74

99

50

500

Reflex Testing

None

Limitations

  • Ortho reports a bias with the following:
    • Glutathione at 61.5 mg/dL has a -8.6 bias
  • Ortho reports no significant interference with the following:
    • Bilirubin at 40 mg/dL

Useful For

Glucose is a primary cellular energy source. Fasting plasma glucose concentrations and tolerance to a dose of glucose are used to establish the diagnosis of diabetes mellitus and disorders of carbohydrate metabolism. Glucose measurements are used to monitor therapy in diabetics and in patients with dehydration, coma, hypoglycemia, insulinoma, acidosis, and ketoacidosis.