Skip to main content
Clinical Biochemistry

Alert COVID-19

Please find service updates and current visiting rules in our COVID-19 section.

This site is best viewed with a modern browser. You appear to be using an old version of Internet Explorer.


Also known as: K

Specimen requirements

Sample type: Plasma (Lithium Heparin)

Collection requirements: Specimen should to be received and processed within 24 hours of collection. Results on specimens received more than 24 hours after collection should be interpreted with caution.


Price on application

Turnaround time

Please see Turnaround times

Analytical method

Ion-selective electrode

Analysis undertaken at these site(s)

  • John Radcliffe Hospital
  • Churchill Hospital
  • Horton General Hospital

Reference intervals


All ages: 3.5 - 5.0 mmol/L


All ages: 3.5 - 5.0 mmol/L