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Test Code KS Potassium, Serum


Necessary Information


Patient's age and sex are required.



Specimen Required


Collection Container/Tube: 

Preferred: Serum gel 

Acceptable: Red top 

Submission Container/Tube: Plastic vial 

Specimen Volume: 0.5 mL 

Collection Instructions:

1. Serum gel tubes should be centrifuged within 2 hours of collection. 

2. Red-top tubes should be centrifuged, and the serum aliquoted into a plastic vial within 2 hours of collection. 


Useful For

Evaluation of electrolyte balance, cardiac arrhythmia, muscular weakness, hepatic encephalopathy, and renal failure

Reporting Name

Potassium, S

Specimen Type

Serum

Specimen Minimum Volume

0.25 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated 48 hours

Reject Due To

Gross hemolysis Reject
Gross lipemia OK

Reference Values

<1 year: not established

≥1 year: 3.6-5.2 mmol/L

Method Description

Ion-selective electrode (ISE) (indirect potentiometry). The ISE module performs indirect measurement of electromotive force (EMF). The ISE module measures the EMF difference between an ion-selective electrode and a reference electrode. The EMF of the ion-selective electrode is dependent on the ion concentration of the sample. The EMF of the reference electrode is constant. An electronic calculation circuit converts EMF of the sample to the ion concentration of the sample.(Package insert: Roche Diagnostics ISE reagent; Indianapolis, IN, 2006)

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 to 2 days

Specimen Retention Time

1 week

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

84132

LOINC Code Information

Test ID Test Order Name Order LOINC Value
KS Potassium, S 2823-3

 

Result ID Test Result Name Result LOINC Value
KS Potassium, S 2823-3

Forms

If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

-Kidney Transplant Test Request

-Renal Diagnostics Test Request (T830)