24-hour urine collection

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24-hour urine collection Article

24-hour urine collection

creatinine-clearance sodium-urine potassium-urine urea-nitrogen-urine

Definition

The urine 24-hour volume test measures the amount of urine produced in a day.

Alternative Names

Urine volume; 24-hour urine collection

Why the 24-hour urine collection is Performed

Urine volume is normally measured as a part of the creatinine clearance test, or any test that measures the amount of a substance eliminated in a day.

How the 24-hour urine collection is Performed

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 24-hour urine collection

The health care provider will instruct you, if necessary, to stop taking any drugs that may interfere with the test results.

If the collection is being taken from an infant, a couple of extra collection bags may be necessary.

How the 24-hour urine collection Will Feel

The test involves only normal urination, and there is no discomfort.

Normal Results

The normal range is 800 to 2000 milliliter per day (with a normal fluid intake of about 2 liters per day).

Note: 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

Disorders that cause reduced urine volume include dehydration, inadequate fluid intake, or renal insufficiency or failure.

Some of the conditions that cause increased urine volume include:

Diabetes insipidus - renal
Diabetes insipidus - central
Diabetes
End-stage renal disease
High fluid intake
Some forms of kidney failure
Use of diuretic medications

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