Why do I need a phosphate in urine test?Most people with high phosphate levels don't have any symptoms.You may need a phosphate in urine test if you have symptoms of a low phosphate level. These include:FatigueMuscle crampingLoss of appetiteJoint painYou may also need a phosphate in urine test if you've had abnormal results on a calcium test. Calcium and phosphate work together, so problems with calcium levels can mean problems with phosphate levels as well. Calcium testing in blood and/or urine is often part of a routine checkup.
