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Potassium - urine
Definition
The potassium urine test measures the amount of potassium in the urine.
Alternative Names
Urine potassium
Why the Test is Performed
Your doctor may order this test if you have signs of a condition that affects body fluids. This may include dehydration, vomiting, or diarrhea.
It may also be done to diagnose or confirm disorders of the kidneys or adrenal glands.
Additional conditions under which the test may be performed include medullary cystic disease.
How the Test is Performed
This test may be done with a random urine sample or 24-hour urine sample.
If a 24-hour urine sample is needed:
- On day 1, urinate into the toilet when you get up in the morning.
- Afterwards, collect all urine in a special container for the next 24 hours.
- On day 2, urinate into the container when you get up in the morning.
- Cap the container. Keep it in the refrigerator or a cool place during the collection period.
- Label the container with your name, the date, the time of completion, and return it as instructed.
For an infant, thoroughly wash the area around the urethra. Open a urine collection bag (a plastic bag with an adhesive paper on one end), and place it on the infant. For males, place the entire penis in the bag and attach the adhesive to the skin. For females, place the bag over the labia. Diaper as usual over the secured bag.
This procedure may take a couple of attempts -- lively infants can move the bag, causing the urine to be absorbed by the diaper. Check the infant frequently and change the bag after the infant has urinated into it. Drain the urine from the bag into the container provided by your health care provider.
Deliver it to the laboratory or your health care provider as soon as possible upon completion.
How to Prepare for the Test
If the collection is being taken from an infant, a couple of extra collection bags may be necessary.
Your health care provider may tell you to temporarily stop taking certain drugs that may affect test results. Drugs that can affect urine potassium measurements include:
- Certain antibiotics
- Diuretics
- Glucocorticoids
- Nonsteroidal anti-inflammatories
How the Test Will Feel
This test involves only normal urination, and there is no discomfort.
Risks
There are no risks.
Normal Results
The usual range for a person on a regular diet is 25 to 120 milliequivalents per liter per day. However, lower or higher urinary levels may occur depending on dietary potassium intake and the relative amount of potassium in the body.
Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What Abnormal Results Mean
Higher-than-normal urine potassium levels may be due to:
Low urine potassium levels may be due to the use of glucocorticoids or nonsteroidal anti-inflammatories.
Too much or too little potassium in the diet may also affect test results.
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Typical mistypes for Potassium - urine
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