Does this test have other names?

Phosphorus blood test, phosphate test

What is this test?


Having a high or low level of phosphorus in your bloodstream can signal a number of health conditions. Most commonly, a high level of phosphorus is related to a kidney disorder and shows that your kidneys are having difficulty clearing phosphorus from your blood. A high level of phosphorus can also indicate uncontrolled diabetes and other endocrine disorders.

Why do I need this test?

You may need a phosphorus test if your health care provider suspects that you have a kidney disorder or if you are having trouble controlling your diabetes. You may also need this test if you have symptoms of kidney disease, including bone problems, fatigue, and weakness, but you may not have any symptoms at all.

What other tests might I have along with this test?

Phosphorus levels are closely related to calcium levels, so your doctor will probably test your calcium level as well. Additional tests depend on which condition your health care provider suspects.

What do my test results mean?



How is this test done?


Does this test pose any risks?


What might affect my test results?


  • Chocolate

  • Cheese

  • Fish

  • Many types of beans

  • Beer

  • Cola

Some medications and medical procedures, such as dialysis, can also affect phosphorus levels.

How do I get ready for this test?


