Phosphate in Urine
The phosphate urine test measures the amount of
phosphate in a sample of urine collected over 24 hours
(24-hour urine test). Phosphate is a charged particle (ion) that contains the
mineral phosphorus. The body needs phosphorus to build
and repair bones and teeth, help nerves function, and make muscles contract.
Most (about 85%) of the phosphorus contained in phosphate is found in bones.
The rest of it is stored in tissues throughout the body.
kidneys help control the amount of phosphate in the
body. Extra phosphate is filtered by the kidneys and passes out of the body in
the urine. If there is not enough phosphate, less is found in the urine. Kidney problems can cause high or low levels of phosphate in the urine. High levels
of phosphate in the urine also may be caused by eating a meal high in phosphorus, having high levels of vitamin D in your body, or having an overactive
parathyroid gland. Some types of tumors may also cause high levels of phosphate in the urine.
Tests for calciumand creatinine levels may be done at the same time as a phosphate urine test.
Why It Is Done
A test to measure phosphate in urine may be done to:
- Help diagnose kidney problems that affect
- Help find the cause of
How To Prepare
Many medicines can change the results of this test. Be sure to tell
your doctor about all the nonprescription and prescription medicines you
Talk to your doctor about any concerns you have regarding the need
for the test, its risks, how it will be done, or what the results may mean.
To help you understand the importance of this test, fill out the
medical test information form(What is a PDF document?).
How It Is Done
Urine phosphate is usually measured in a sample taken from all the
urine produced in a 24-hour period.
To collect your urine for 24 hours:
- Start in the morning.
When you first get up, empty your bladder but do not save this urine. Write
down the time that you urinated to mark the beginning of your 24-hour
- For the next 24 hours, collect all your urine.
Your doctor's office or lab will usually provide you with a large container
that holds about 1 gal (4 L).
The container has a small amount of preservative in it. Urinate into a small,
clean container and then pour the urine into the large container. Do not touch
the inside of the container with your fingers.
- Keep the large
container in the refrigerator for the 24 hours.
- Empty your bladder
for the final time at, or just before the end of, the 24-hour period. Add this
urine to the large container and record the time.
- Do not get toilet
paper, pubic hair, stool (feces), menstrual blood, or other foreign matter in
the urine sample.