Laboratory Test Information Guide

Details for Potassium,Plasma

Test Name: Potassium,Plasma
Alternate Name(s):  
Laboratory: Core
Specimen Type: 4.5 mL Green top Vacutainer

Serum from a 5mL Gold top or 6mL Red top is also acceptable.

0-2 years: 0.6 mL Green Microtainer
2-10 years: 3 mL Green top tube
Collection Information: Collect blood aseptically in a Vacutainer tube.

Unspun samples need be sent to lab under 4 hours.
Test Schedule: As required
Turnaround time from when specimen
is received in testing laboratory:
4 hours
1 hour
Reference Range: 0-3 months:
4.00-6.50 mmol/L

>3 months:
3.50-5.00 mmol/L
Effective Date: 2008-11-15
Revised Date: 2014-02-25
Critical Value: 0-3 months: >6.5 mmol/L
>3 months: <3.0 or >6.0 mmol/L
Interpretive Comments: Useful for monitoring potassium status in patients on intravenous therapy, in diabetic ketoacidosis or on diuretics. Investigation of mineralocortocoid status, evaluation of electrolyte balance, acid-base disturbances, cardiac arrhythmia, muscular weakness, hepatic encephalopathy, GIT fluid losses and renal failure.
Special Processing:  
Comments: Hemolysis during collection, delay in separation, refrigeration of unseparated blood, marked luecocytosis and/or thrombocytosis and muscle activity of limb immediately prior to venipuncture may cause significant increase in potassium.
Method of Analysis: Potentiometric, Indirect Ion-Selective Electrodes
Critical Information Required:  
Storage & Shipment:  
System Codes: 
Referred To:  

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