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HelpTest Code LAB81 Glucose Fasting
Clinical System Name
Glucose Fasting
Synonyms
LAB81
GLU F
FBS
Fasting blood sugar
fasting glucose
Sample Requirements
Specimen: Whole Blood
Container(s): Lt. Green/Mint Top Lithium Heparin, Lt. Green/Lithium Heparin Microtainer, Gold SST, Gold Microtainer, Dark Green/Sodium Heparin, Red, or Heparinized Syringe
Preferred Vol: 1 mL
Minimum Vol: 0.5 mL
Notes: Fasting for infants is 4 hours, 8 hours for all other ages. Method is affected by line contamination and hemolysis. Not affected by sodium fluoride.
Processing Instructions
Reject due to: Age of specimen, hemolysis, line contamination
Spin: Y
Aliquot: Y
Storage location: Core 5 Chemistry Refrigerator
Off-site collection: Avoid hemolysis and line contamination. Spin blood, refrigerate serum or plasma. Method not affected by sodium fluoride.
Stability
| Specimen Type | Temperature | Time |
|---|---|---|
|
Whole Blood |
RT | ≤ 30 min |
| Serum or Plasma | RT |
≤ 24 H |
| Serum or Plasma | 0-4 C |
≤ 7 D |
| Serum or Plasma | -20 C or -70 C |
≤ 365 D |
Availability
| STAT | Performed | TAT |
|---|---|---|
| Y | 24/7 | 1 H |
Performing Laboratory
Seattle Children's Laboratory
Department
Department: Core Chemistry
Phone Number: 206-987-2617 (Client Services)
CPT Codes
82947
Methodology
Method: Colorimetric method by Vitros 4600 or Amperometric method by Rapidpoint 500
Analytical Volume: Vitros 4600: 0.02 mL + 0.03 mL dead space
Rapidpoint 500: 0.20 mL
Reference Range
| Age | mg/dL |
| All Ages | 60 - 100 |
Description
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.
Critical Values
| Age | mg/dL |
| 0- 1 M |
≤ 50 or ≥ 300 |
| 1 M -Adult |
≤ 50 or ≥ 700 |