Test Overview
The phosphate urine test measures the amount of
in a sample of urine collected over 24 hours
(24-hour urine test). Phosphate is a charged particle (ion) that contains the
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
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. A high
level of phosphate in the urine may be caused by a kidney problem. High levels
also may be caused by eating a meal high in phosphorus or by an overactive
.