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23038 Sodium

Sodium
Test Code: NA
Synonyms/Keywords
Na, Serum​, i-Stat Sodium
Useful For
Sodium measurements are used in the diagnosis and treatment of aldosteronism (excessive secretion of hormone aldosterone), diabetes insipidus, adrenal hypertension, Addison's disease, dehydration, inappropriate antidiuretic hormone secretion, or other diseases involving electrolyte imbalance.​
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)
​No ​ Plasma​/Serum Lithium-heparin Plasma Separator (PST)​, Serum Separator Tube (SST) Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT) 1 mL​ 0.3 mL​ 0.6 mL whole blood​
​i-Stat only = Whole Blood ​Lithium-heparin Green Top Tube (GTT) ​1 mL ​200 uL
Collection Processing Instructions
Stat orders will be run locally on the i-Stat.  Non-stat orders will be sent to Marshfield for analysis.
​i-Stat:  Sample must be tested within 10 minutes of collection.
Specimen Stability Information
Specimen Type Temperature Time
Plasma/Serum​ ​ ​ Ambient​ 5 days​
Refrigerate​ 7 days​
Frozen 1 year​
​i-Stat Whole Blood ​Ambient ​10 minutes
Rejection Criteria
Collections with potassium oxalate/sodium fluoride
​i-Stat testing:  clotted samples
​i-Stat testing:  anticoagulants other than lithium heparin
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Bloomer​ ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Cadott ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Chetek ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Chippewa Falls ​Monday through Friday ​Less than 2 hours​ ​ISE/Siemens Dimension
​Colby/Abbotsford ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Cornell ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Cumberland ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Diagnostic Treatment Center ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Eagle River ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Eau Claire ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Flambeau Hospital ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Hayward ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Ladysmith ​Monday through Friday ​Less than 2 hours​ ​ISE/Siemens Dimension
​Lake Hallie ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Lakeview Medical Center ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
Marshfield​ Monday through Sunday​ Less than 2 hours​ ISE/Beckman AU
​Menomonie ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Mercer ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Merrill ​Monday through Saturday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Minocqua ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
Mosinee​ ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Oakwood ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Phillips ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Rhinelander ​Monday through Friday 1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat​
​Stettin ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Stevens Point ​Monday through Friday ​Less than 2 hours​ ​ISE/Siemens Dimension
​Wausau ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Wisconsin Rapids ​Monday through Friday ​Less than 2 hours​ ​ISE/Siemens Dimension
​Wittenberg ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
 ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
Reference Range Information
Performing Location Reference Range
All Performing Sites 133-144 mmol/L​
​ ​See Critical Value List for list of current critical values​
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
84295 ​
Synonyms/Keywords
Na, Serum​, i-Stat Sodium
Ordering Applications
Ordering Application Description
​Centricity ​Sodium (NA)
​Cerner ​Sodium Level
​COM ​Sodium - Blood
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
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)
​No ​ Plasma​/Serum Lithium-heparin Plasma Separator (PST)​, Serum Separator Tube (SST) Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT) 1 mL​ 0.3 mL​ 0.6 mL whole blood​
​i-Stat only = Whole Blood ​Lithium-heparin Green Top Tube (GTT) ​1 mL ​200 uL
Collection Processing
Stat orders will be run locally on the i-Stat.  Non-stat orders will be sent to Marshfield for analysis.
​i-Stat:  Sample must be tested within 10 minutes of collection.
Specimen Stability Information
Specimen Type Temperature Time
Plasma/Serum​ ​ ​ Ambient​ 5 days​
Refrigerate​ 7 days​
Frozen 1 year​
​i-Stat Whole Blood ​Ambient ​10 minutes
Rejection Criteria
Collections with potassium oxalate/sodium fluoride
​i-Stat testing:  clotted samples
​i-Stat testing:  anticoagulants other than lithium heparin
Useful For
Sodium measurements are used in the diagnosis and treatment of aldosteronism (excessive secretion of hormone aldosterone), diabetes insipidus, adrenal hypertension, Addison's disease, dehydration, inappropriate antidiuretic hormone secretion, or other diseases involving electrolyte imbalance.​
Reference Range Information
Performing Location Reference Range
All Performing Sites 133-144 mmol/L​
​ ​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
Bloomer​ ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Cadott ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Chetek ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Chippewa Falls ​Monday through Friday ​Less than 2 hours​ ​ISE/Siemens Dimension
​Colby/Abbotsford ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Cornell ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Cumberland ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Diagnostic Treatment Center ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Eagle River ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Eau Claire ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Flambeau Hospital ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Hayward ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Ladysmith ​Monday through Friday ​Less than 2 hours​ ​ISE/Siemens Dimension
​Lake Hallie ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Lakeview Medical Center ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
Marshfield​ Monday through Sunday​ Less than 2 hours​ ISE/Beckman AU
​Menomonie ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Mercer ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Merrill ​Monday through Saturday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Minocqua ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
Mosinee​ ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Oakwood ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
​​ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Phillips ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Rhinelander ​Monday through Friday 1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat​
​Stettin ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
​Stevens Point ​Monday through Friday ​Less than 2 hours​ ​ISE/Siemens Dimension
​Wausau ​Monday through Sunday​ ​Less than 2 hours​ ​ISE/Siemens Dimension
​Wisconsin Rapids ​Monday through Friday ​Less than 2 hours​ ​ISE/Siemens Dimension
​Wittenberg ​Monday through Friday
1 day (sent to Marshfield)
* stat order on i-Stat run locally = Less than 2 hours
 ISE/Beckman AU
​Ion-Selective Electrode Potentiometry/i-Stat
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)
Quantity Description Comments
84295 ​
For most current information refer to the Marshfield Laboratory online reference manual.