Sign in →

Test Code WBK K, Whole blood, LAB2960

Important Note

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




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


For CAB testing when the whole blood potassium is routinely performed.


The patient has ABGS, VBG or MOST ordered concurrently with the potassium 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

3.5 – 5.0 mmol/L

Useful For

Potassium measurements are used to monitor electrolyte balance in the diagnosis and treatment of disease conditions characterized by low or high blood potassium levels. 

Day(s) Test Set Up

Monday through Sunday


Potentiometric Sensor

Test Classification and CPT Coding