A blood test is when a sample of blood is taken from the body to be tested in a lab. Doctors order blood tests to check things such as the levels of glucose, hemoglobin, or white blood cells. This can help them detect problems like a disease or medical condition. Sometimes, blood tests can help them see how well an organ (such as the liver or kidneys) is working.
The comprehensive metabolic panel (CMP) is a blood test that gives doctors information about the body's fluid balance, levels of electrolytes like sodium and potassium, and how well the kidneys and liver are working.
A CMP is done to learn information about the levels of:
You may be asked to stop eating and drinking for 8–12 hours before a CMP. Tell your doctor about any medicines you take because some drugs might affect the test results. Wearing a T-shirt or short-sleeved shirt can make things easier for you on the day of the test.
If you have questions about the CMP or what the test results mean, talk to your doctor.
Reviewed by: Larissa Hirsch, MD
Date Reviewed: Mar 20, 2023
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