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Glucose, Fasting
MessageTest performed at York Hospital Laboratory.
Test Code
GLUF
CPT Codes
82947
Preferred Specimen
0.2 mL serum collected in a serum separator tube (SST)
Other Acceptable Specimens
0.2 mL serum collected in a no additive (red-top) tube, transferred to a plastic screw-cap vial 0.2 mL plasma collected in a lithium heparin (green-top) gel separator tube. Patient Preparation:Overnight fasting is required.
Instructions
Remove serum or plasma from the cellular material within 90 minutes of collection (preferably 1 hour).
Transport Temperature
Refrigerated
Specimen Stability
Room temperature: 24 hours
Refrigerated: 7 days
Frozen: 1 year
Refrigerated: 7 days
Frozen: 1 year
Methodology
Colorimetric
Setup Schedule
Daily
Report Available
Next Day Available STAT 1/2 Hour
Reference Range
65-100 mg/dL
Critical Values
Critical Values
| Age | Glucose (mg/dL) |
|---|---|
| <=42 Days | < 41 or > 199 |
| 1-18 Years | < 51 or > 299 |
| Adult | < 50 or > 500 |
Clinical Significance
Fasting 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.
