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Comprehensive metabolic panel
Definition
A comprehensive metabolic panel is a group of chemical tests performed on the blood serum (the part of blood that doesn't contain cells).
This test provides an overall picture of your body's metabolism. Metabolism refers to all the physical and chemical processes in the body that use energy.
Alternative Names
Metabolic panel - comprehensive; Chem-20; SMA20; Sequential multi-channel analysis with computer-20; SMAC20; Metabolic panel 20
How the test is performed
A blood sample is needed. For information on how this is done, see: Venipuncture
How to prepare for the test
You should not eat or drink for 8 hours before the test.
How the test will feel
When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there may be some throbbing.
Why the test is performed
This test will give your doctor information about:
- How your kidneys and liver are working
- Blood sugar, cholesterol, and calcium levels
- Sodium, potassium, and chloride levels (called electrolytes)
- Protein levels
Your doctor may order this test during a yearly exam or routine checkup.
Normal Values
- Albumin: 3.9 to 5.0 g/dL
- Alkaline phosphatase: 44 to 147 IU/L
- ALT (alanine aminotransferase): 8 to 37 IU/L
- AST (aspartate aminotransferase): 10 to 34 IU/L
- BUN (blood urea nitrogen): 7 to 20 mg/dL
- Calcium: 8.5 to 10.9 mg/dL
- Chloride: 101 to 111 mmol/L
- CO2 (carbon dioxide): 20 to 29 mmol/L
- Creatinine: 0.8 to 1.4 mg/dL **
- Glucose test: 100 mg/dL
- Potassium test: 3.7 to 5.2 mEq/L
- Sodium: 136 to 144 mEq/L
- Total bilirubin: 0.2 to 1.9 mg/dL
- Total protein: 6.3 to 7.9 g/dL
**Note: Normal or healthy values for creatinine can vary with age. Normal value ranges for all tests may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
Key to abbreviations:
- IU = international unit
- L = liter
- dL = deciliter = 0.1 liter
- g/dL = gram per deciliter
- mg = milligram
- mmol = millimole
- mEq = milliequivalents
What abnormal results mean
Abnormal results can be due to a variety of different medical conditions, including kidney failure, breathing problems, and diabetes-related complications. See the individual tests listed in the normal values section for detailed information.
What the risks are
There is very little risk involved with having your blood taken. Veins and arteries vary in size from one patient to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight but may include:
- Excessive bleeding
- Fainting or feeling light-headed
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)
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