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Test Code K Potassium, LAB114


Indirect Potentiometric

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Green-top (lithium heparin) tube-Hemolyzed specimen is not acceptable.

Acceptable: Gold-top serum gel tube or plain red-top tube

Specimen Volume: 0.1 mL of plasma or serum

Stability: Potassium in serum and plasma is stable for at least one week either at room or

               refrigerator (2-8ºC) temperature and for at least one year frozen.


Reference Values

3.5-5.0 mmol/L

Critical values

0-30 days: <3.0 mmol/L or >7.0 mmol/L

≥1 month: <3.0 mmol/L or >6.0 mmol/L

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


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.