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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.

To help your child get ready for a blood test, find out if they need to fast (not eat or drink) or should stop taking medicines before the test. Explain what to expect during the test. If your child is anxious about it, work together on ways to stay calm.

What Is Phosphorus?

Phosphorus (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 child has a medical condition that makes high or low phosphorus levels more likely, such as a kidney problem.

What if I Have Questions?

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