Potassium levels can be tested with a blood test or a urine test. Urine potassium can be checked in a single urine sample. But it is more often measured in a 24-hour urine sample. Your doctor will decide if a urine or blood sample is needed.

SPECIMEN: 2 mL (1 mL min.) serum from 1 SST. Separate serum from cells within 1 hour of collection. Ship refrigerated or frozen. Hemolysed samples not acceptable.
STABILITY: Room: 2 hrs; Refrigerated: 72 hrs; Frozen: 1 week
REPORT: Daily
INSTRUCTIONS: No special preparation required
USAGE: Potassium is an essential element involved in critical cell functions. Potassium levels are influenced by electrolyte intake, excretion and other means of elimination, exercise, hydration and medications.