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.
Urine potassium can be measured in a 24h urine or a random urine
None given. Interpret in conjunction with the serum concentration