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Blood Test: Phosphorus

What Is a Blood Test?

By taking and testing a small sample of a person’s blood, doctors can check for many kinds of diseases and conditions. Blood tests help doctors check how the body’s organs are working and see if medical treatments are helpful.

What Is Phosphorus?

Phosphorus (pronounced: FOSS-fer-iss) is a mineral that helps bones and teeth form. It also helps make protein and energy, and helps keep muscles and nerves working well.

Why Are Phosphorus Tests Done?

This test measures the amount of phosphorus in the blood. Doctors may order a phosphorus test if a person has a medical condition that makes high or low phosphorus levels more likely, such as a kidney problem.

Are There Any Risks From Phosphorus Tests?

A phosphorus test is a safe procedure with minimal risks. Some people might feel faint or lightheaded from the test. A few teens have a strong fear of needles. If you're anxious, talk with the doctor before the test about ways to make the procedure easier.

A small bruise or mild soreness around the blood test site is common and can last for a few days. Get medical care if the discomfort gets worse or lasts longer.

What if I Have Questions?

If you have questions about the phosphorus blood test, or what the test results mean, talk to your doctor.

Reviewed by: Larissa Hirsch, MD
Date Reviewed: Apr 10, 2023

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