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HelpTest Code FBS Glucose, Fasting
Useful For
Glucose measurements are used in the diagnosis and treatment of carbohydrate metabolism disorders, including diabetes mellitus, neonatal hypoglycemia and idiopathic hypoglycemia, and pancreatic islet cell carcinoma.
Synonyms/Keywords
Glucose Fasting Blood Sugar, i-Stat Fasting Blood Sugar
Specimen Requirements
| Fasting Required | Specimen Type | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
Pediatric Minimum Volume (no repeat) |
|---|---|---|---|---|---|---|
|
Yes 8 hours |
Plasma/Serum | Lithium-heparin Plasma Separator (PST), Serum Separator Tube (SST) | Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT) Gray Top (GYTT) | 1 mL | 0.3 mL |
Collection/Processing Instructions
Patient is to be fasting for 8 hours prior to specimen collection. Water is permitted during the fasting period.
Samples collected in tubes without gel barriers must be centrifuged and removed from the cells within one hour for storage or transport.
Samples collected in gel barrier tubes must be centrifuged and removed from the primary tube prior to transporting to Marshfield.
Do not send the primary collection tube.
Indicate time of collection.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma/Serum | Ambient | 5 days |
| Refrigerate | 7 days | |
| Frozen | 1 year |
Rejection Criteria
| Specimens in contact with cells for more than 2 hours without a preservative (fluoride/oxalate) |
|---|
Reference Range Information
| Performing Location | Reference Range |
|---|---|
| All Performing Sites | 70-99 mg/dL (fasting) |
| See Critical Value List for list of current critical values | |
Marshfield Labs Performing Department
Marshfield Labs Chemistry
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Beaver Dam | Monday through Sunday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Chippewa Falls | Monday through Friday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Weston | Monday through Sunday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Eau Claire | Monday through Sunday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Park Falls | Monday through Sunday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Ladysmith | Monday through Sunday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Rice Lake | Monday through Sunday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Marshfield | Monday through Sunday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Minocqua | Monday through Sunday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Neillsville | Monday through Sunday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Stevens Point | Monday through Friday | Less than 2 hours | Hexokinase-UV/NAD Endpoint Assay/Beckman AU |
| Wisconsin Rapids | Monday through Friday | Less than 2 hours | Modified Hexokinase Method/Siemens Dimension |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 82947 | 1 |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 82947 | 1 |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | Glucose Fasting |