Skip Ribbon Commands
Skip to main content
Sign In
Navigate Up

23134 Glucose, Fasting

Glucose, Fasting
Test Code: FBS
Synonyms/Keywords
​​Glucose Fasting Blood Sugar, i-Stat Fasting Blood Sugar​
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.​
Specimen Requirements
 
 

Fasting Required
 Specimen Type Pref​erred 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)


Performing Laboratory 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
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 ​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
82947   ​ ​ ​1
 ​ ​
Synonyms/Keywords
​​Glucose Fasting Blood Sugar, i-Stat Fasting Blood Sugar​
Ordering Applications

Ordering Application Description
​Cerner
 ​Glucose Fasting

If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
 
 

Fasting Required
 Specimen Type Pref​erred 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
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)


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.​
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 ​
For more information visit:
Performing Laboratory 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
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
82947   ​ ​ ​1
 ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.