Preferred Sample Type

Potassium (urine)

Suitable Specimen Types

Plain Spot Urine 24 Hour Urine Plain

Potassium (urine)

Specimen Volume

Random or 24 hour collection

Sample Preparation


Turnaround Time

1 Day

Sample Processing In Laboratory


Sample Stability


General Information

Urinary potassium is a useful test in the differential diagnosis of hypokalaemia.

In hypokalaemia, a random urine potassium concentration > 20 mmol/L suggests renal potassium loss, and <20 mmol/L suggests gastrointestinal potassium loss respectively as being the cause of the hypokalaemia.

Patient Preparation



Urine potassium can be measured in a 24h urine or a random urine

Reference Range

None given. Interpret in conjunction with the serum concentration


  • EQA Status: NEQAS
  • EQAS Scheme: Yes

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