A potassium test checks how much potassium is in your blood or urine. Potassium helps keep the body's water and electrolytes in balance. It is also important in how nerves and muscles work.
Potassium levels can be tested by having a blood sample taken or by collecting your urine. Urine potassium can be checked in a single urine sample. But it is more often measured in a 24-hour urine sample.
A blood or urine test for potassium may be done to:
For 24-hour urine collection, your doctor or lab will usually give you a large container that holds about 4 litres.
A health professional takes a sample of your blood.
After a blood test:
After a urine test, you will need to return the urine sample to the lab or the doctor's office.
Watch closely for changes in your health, and be sure to contact your doctor or nurse call line if you have questions about the test.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if you are having problems. It's also a good idea to keep a list of the medicines you take. Ask your doctor when you can expect to have your test results.
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Current as of: October 9, 2017
Adam Husney, MD - Family Medicine
& Martin J. Gabica, MD - Family Medicine
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