2 hours
Test Updated:
Looking to order a test?
We’ve provided helpful links to make ordering easy.
Find a RequisitionAll specimens should be accompanied by a requisition.
Submitting SpecimensLearn about how to properly label and where to ship specimens.
Order Kits and SuppliesMLabs provides all the supplies necessary for the collection of specimens.
Test FAQVisit our provider FAQ and learn about common questions to ordering tests.
Test Overview
Potentiometric (ISE)
Evaluate electrolyte balance
<1 year: 2.6 - 5.5 mmol/L, 1-11 years: 3.3 - 5.0 mmol/L, 12-150 years: 3.5 - 5.0 mmol/L
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Specimen Requirements
Collect specimen in green top heparin tube. Centrifuge within 4 hours of collection, aliquot plasma into a plastic vial and refrigerate. If specimen cannot be centrifuged at client site, please arrange for delivery to MLabs within 3 hours of specimen collection. Grossly hemolyzed samples are unacceptable for analysis.