Menu   WellSpan Health

Health Library

Health Library

Comprehensive Metabolic Panel

Does this test have other names?

Metabolic panel, CMP, chem 14, chemistry panel, chemistry screen, (formerly SMAC, sequential multiple analyzer chemistry)

What is this test?

This test is a screening panel of 14 tests that look at your metabolism.

Your body gets energy from food through a process called metabolism. The tests in this panel help see how well your liver and kidneys are working. These are two major organs involved in metabolism.

These tests also measure your electrolyte and acid/base balance, your blood sugar, and your blood proteins. Electrolytes are mineral salts that help move nutrients into your cells and move waste products out of your cells. Electrolytes also help keep your body's fluid and acidity (pH) levels where they should be.

Most labs do the same 14 tests, but these may be changed depending on what your healthcare provider is looking for. They may also vary slightly between labs. The 14 tests that are included in most CMPs are:

  • Albumin, a liver protein

  • Alkaline phosphatase (ALP)

  • Alanine aminotransferase (ALT)

  • Aspartate aminotransferase (AST)

  • Blood urea nitrogen (BUN)

  • Calcium

  • Carbon dioxide, an electrolyte

  • Chloride, an electrolyte

  • Creatinine

  • Glucose

  • Potassium, an electrolyte

  • Sodium, an electrolyte

  • Total bilirubin

  • Total protein

Why do I need this test?

You may have this test as part of a routine physical. You may also have this test done to check for kidney and liver diseases. It can also check on many other problems, including diabetes.

If you take medicines for high blood pressure, you may have this test to see how your kidneys and liver are working. You may also have this test if you take other medicines that can affect your kidneys or liver.

What other tests might I have along with this test?

Your healthcare provider may also order other tests to look at how well your liver and kidneys are working. These tests may include:

  • Prealbumin

  • Gamma-glutamyl transpeptidase, or GGT

  • Urine tests

Your healthcare provider may also order other blood tests to check for iron deficiency, anemia, and other disorders:

  • Complete blood count, or CBC

  • Serum iron level

  • Ferritin

  • Transferrin

  • Hemoglobin

What do my test results mean?

Many things may affect your lab test results. These include the method each lab uses to do the test. Even if your test results are different from the normal value, you may not have a problem. To learn what the results mean for you, talk with your healthcare provider.

Normal findings for the 14 tests are:

  • Albumin: 3.5 to 5.0 grams per deciliter (g/dL)

  • ALP: 30 to 120 international units/liter (IU/L)

  • ALT: 4 to 36 IU/L

  • AST: 0 to 35 IU/L

  • BUN: 10 to 20 milligram/per deciliter (mg/dL)

  • Calcium: 9.0 to 10.5 mg/dL

  • Carbon dioxide: 23 to 30 millimoles per liter (mmol/L)

  • Chloride: 96 to 106 mmol/L

  • Creatinine: 0.5 to 1.1 mg/dL (females), 0.6 to 1.2 mg/dL (males)

  • Glucose test: less than 110 mg/dL

  • Potassium test: 3.5 to 5.0 milliequivalents per liter (mEq/L)

  • Sodium: 136 to 145 mEq/L

  • Total bilirubin: 0.3 to 1.0 mg/dL

  • Total protein: 6.4 to 8.3 g/dL

If your results are abnormal or combinations of abnormal levels, it may mean you have problem, such as diabetes, liver disease, or kidney disease. You may need more tests to confirm or rule out specific diagnoses.

How is this test done?

The test requires a blood sample, which is drawn through a needle from a vein in your arm.

Does this test pose any risks?

Taking a blood sample with a needle carries risks that include bleeding, infection, bruising, or feeling dizzy. When the needle pricks your arm, you may feel a slight stinging sensation or pain. Afterward, the site may be slightly sore.

What might affect my test results?

Eating or exercising before the test can affect your results. Taking certain medicines can also affect your results. These include steroids, insulin, and hormones.

If you are pregnant or dehydrated, your results may be affected.

How do I get ready for this test?

You should not eat or drink anything but water for 10 to 12 hours before this test. Don't exercise before the test. In addition, be sure your healthcare provider knows about all medicines, herbs, vitamins, and supplements you are taking. This includes medicines that don't need a prescription and any illicit drugs you may use. 

Comprehensive Metabolic Panel - WellSpan Health

Author: Orenstein, Beth W
Online Medical Reviewer: Hanrahan, John, MD
Online Medical Reviewer: Sather, Rita, RN
Last Review Date: 2015-07-23T00:00:00
Last Modified Date: 2015-08-19T00:00:00
Published Date: 2015-08-19T00:00:00
Last Review Date: 2012-07-09T00:00:00
© 2015 WellSpan Health. All Rights Reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.

I would like to:

Are you sure you would like to cancel?

All information will be lost.

Yes No ×

About the provider search

This search will provide you with WellSpan Medical Group and Northern Lancaster County (Ephrata) Medical Group primary care physicians and specialists. If we don’t have a WellSpan Medical Group physician to meet your criteria, the search will expand to include community physicians who partner with WellSpan Medical Group physicians through the WellSpan Provider Network or provide care to patients on the Medical Staffs of WellSpan’s Hospitals.


Schedule Your Next Appointment Online with MyWellSpan

Use your MyWellSpan patient portal any time to view available appointments, and pick the date and time that best suits your schedule.

Go to MyWellSpan

New to this practice?

If you don't have a WellSpan primary care provider and would like to schedule a new patient appointment with a provider who is accepting patients, just log into your MyWellSpan account, and go to the Appointment Center section. As you progress through the scheduling process, you will be able to see the offices that are accepting new patients in relation to your zip code. If you are not enrolled in MyWellSpan, go to, call 1-866-638-1842 or speak with a member of the staff at a participating facility to sign up. New patient scheduling not available at all practices/programs.

Already a patient at this practice?

If you already have a relationship with a WellSpan practice, simply log into your account, and go to the Appointment Center section. As you progress through the scheduling process, you will be able to schedule an appointment with any provider or practice that already counts you as a patient. Online scheduling varies by practice/program.