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Test Code WBNA Sodium, Whole Blood, LAB2961

Important Note

Sodium will primarily be performed on the Siemens Dimension Vista System.  In the following scenarios the WBNA testing will be performed:




In the Diabetic Ketoacidosis (DKA) protocol initiated by the Emergency Department.  If a concurrent COMPNL or PLCH7 is order the WBNA needs to be credited.


The patient has ABGS, VBG or MOST ordered concurrently with the sodium which will save the patient from having more blood drawn and streamline the processing.


Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: heparinized syringe

Acceptable: Green-top (heparin) tube

Specimen Volume: 65 uL of heparinized whole blood

Stability: Specimens should be analyzed within 30 minutes of collection if whole blood or up to 7 days refrigerated (2-8ºC).



Reference Values

136 – 145  mmol/L

Useful For

Sodium ions play a central role in maintaining the normal distribution of water and the osmotic pressure. Causes of increased values are: dehydration, diabetes insipidus, salt poisoning, hyperaldosteronism, burns, cardiac failure, renal disease and pregnancy.  Causes for decreased values are: severe diarrhea, burns, hypoaldosteronism syndrome of inappropriate antidiuretic hormone (SIADH), excessive sweating, diuretic therapy, and psuedohyponatremia as with hyperlipidemia.

Day(s) Test Set Up

Monday through Sunday


Potentiometric Sensor

Test Classification and CPT Coding