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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.
The 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 calcium and creatinine levels may be done at the same time as a phosphate urine test.
A test to measure phosphate in urine may be done to:
In general, there's nothing you have to do before this test, unless your doctor tells you to.
This test is usually done at home. You must collect all the urine you produce in a 24-hour period.
This test usually doesn't cause any pain or discomfort.
There are no known risks from having this test.
Results are usually available in 1 to 2 days.
Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you.
High urine phosphate levels may be caused by:
Low urine phosphate levels may be caused by:
Current as of:
July 28, 2021
Author: Healthwise StaffMedical Review: E. Gregory Thompson MD - Internal MedicineKathleen Romito MD - Family MedicineAlan C. Dalkin MD - Endocrinology
Current as of: July 28, 2021
Author: Healthwise Staff
Medical Review:E. Gregory Thompson MD - Internal Medicine & Kathleen Romito MD - Family Medicine & Alan C. Dalkin MD - Endocrinology
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