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Quick Guide
A comprehensive metabolic panel (CMP) is a blood test that measures 14 substances from a single sample. It gives a broad picture of how your kidneys, liver, and metabolism are working, along with your electrolyte and fluid balance.
| Detail | Value |
|---|---|
| Sample type | Blood |
| Collection method | In-person blood draw at a lab or clinic |
| Turnaround time | Typically one to three business days |
| Fasting required | Fasting preferred, timing not strictly specified |
| Age requirement | Varies by provider; typically 18+ |
If you’ve been feeling unusually tired, swollen, or just “off,” a CMP can help figure out whether blood sugar, kidney function, liver enzymes, or electrolytes are out of range. A fasting sample is preferred for this test, though the exact window isn’t strictly specified. If you didn’t fast, let the lab know. Your provider can still read most values in context, though glucose will be harder to interpret. Results are typically ready within one to three business days.
About the Comprehensive Metabolic Panel
Purpose of the test
The CMP measures 14 substances in your blood and is often part of a routine checkup that can help diagnose certain conditions. It covers blood sugar, kidney waste products, electrolytes, and liver enzymes together in a single blood draw.
The panel helps check for conditions like diabetes, kidney disease, liver disease, and high blood pressure. It’s useful when symptoms like fatigue, nausea, swelling, or unexplained weight changes don’t point clearly to one cause.
The CMP serves three clinical purposes:
- Screening: Catches early signs of metabolic or organ problems as part of routine preventive care.
- Diagnosis: Helps investigate symptoms like fatigue, swelling, or nausea that suggest a kidney, liver, or blood sugar issue.
- Monitoring: Tracks how well treatment is working and whether medications are affecting organ function.
The CMP doesn’t measure everything. It doesn’t include a complete blood count (CBC), thyroid function, cholesterol, hemoglobin A1c, vitamins, or hormones. Your provider may order those tests alongside it for a broader picture.
What does the Comprehensive Metabolic Panel measure?
The CMP measures 14 substances from a single blood sample. Most lab reports also display calculated values derived from those measurements, bringing the total number of line items on a typical report to 17.
Blood Sugar and Metabolism
- Glucose: The amount of sugar in your blood, the body’s main energy source.
Kidney Function
- Blood Urea Nitrogen (BUN): A waste product from protein breakdown that the kidneys filter out.
- Creatinine with estimated GFR: A muscle waste product, paired with a calculated estimate of how well your kidneys filter blood.
- BUN/Creatinine Ratio: A calculated value comparing BUN and creatinine to help assess kidney blood flow.
Electrolytes and Fluid Balance
- Sodium: The main electrolyte that regulates fluid balance and blood pressure.
- Potassium: An electrolyte that supports heart rhythm, muscle contraction, and nerve signaling.
- Chloride: An electrolyte that helps maintain fluid balance and the body’s acid-base balance.
- Carbon Dioxide (Bicarbonate): Total CO2 in the blood, reflecting the body’s acid-base (pH) balance.
- Calcium: A mineral that supports bone health, muscle function, and nerve signaling.
Liver Function and Proteins
- Albumin: A liver-made protein that keeps fluid in the bloodstream and carries hormones, vitamins, and enzymes.
- Total Protein: The combined level of albumin and globulins in your blood.
- Globulin: A calculated value (total protein minus albumin) reflecting proteins tied to immune function, clotting, and hormone transport.
- Albumin/Globulin Ratio: A calculated comparison of albumin to globulin used to flag protein imbalances.
- Alanine Aminotransferase (ALT): A liver enzyme that rises when liver cells are damaged or inflamed.
- Aspartate Aminotransferase (AST): An enzyme found mainly in the liver and other tissues that signals damage when high.
- Alkaline Phosphatase (ALP): An enzyme linked to liver and bile duct health, as well as bone metabolism.
- Total Bilirubin: A yellow waste product from red blood cell breakdown that the liver processes and excretes.
When should I get a CMP?
Consider testing if any of these apply:
- Fatigue, weakness, nausea, or swelling without a clear cause
- Unexplained weight changes
- A history of kidney or liver disease
- High blood pressure or risk factors for metabolic conditions
- Diabetes or prediabetes that needs monitoring
- A medication that may affect kidney or liver function (such as statins, ACE inhibitors, diuretics, or NSAIDs)
- Baseline labs needed before starting a new treatment
Your provider may also order a CMP if you’re taking a treatment for a medical condition to see if the treatment is working, or if you’re starting a new medication that can affect your kidney or liver function.
For routine screening, a CMP is commonly included in annual preventive blood work. There’s no universal guideline for how often to repeat it. Frequency depends on your health history, any chronic conditions, and your provider’s recommendations.
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How It Works
How to get tested
You can order the Comprehensive Metabolic Panel (CMP) yourself online, with no doctor visit or referral needed. A licensed physician reviews and authorizes your order as part of the process. Most results are ready in one to three business days and appear in your secure online account.
Before the test
Fasting is preferred for this test, though not strictly required. If your provider asks you to fast, drink water, but skip food, coffee, juice, and other beverages. Fasting matters most for the glucose reading. Eating beforehand can push blood sugar higher and make that result harder to read.
Tell your provider about any medications and supplements you take regularly. Some drugs affect kidney markers (creatinine, BUN) or liver enzymes (ALT, AST, ALP). Don’t stop any medication without checking first.
If you missed the fasting window, go anyway. Your provider can still interpret most of the 14 measured substances. Let the lab staff know so they can flag the glucose result.
During the test
- Check in at the lab or clinic with a photo ID and any order confirmation.
- A phlebotomist ties a band around your upper arm, cleans the skin, and inserts a needle into a vein. You’ll feel a brief pinch.
- A single vial of blood is drawn. The whole collection takes about two to three minutes.
- A small bandage covers the site. You can leave right away.
The full visit usually takes 15 to 30 minutes. Some people notice light bruising over the next day or two. That’s normal. Call your provider if you have lasting pain, significant swelling, or signs of infection at the draw site.
After the test
Results are typically ready within one to three business days after the lab receives your sample, though timing can vary by lab. Your results appear in your secure online account. Each marker appears alongside a reference range.
What Do My Results Mean?
The CMP reports 14 measured substances plus calculated values, each with its own reference range. CMP results typically provide the name of the blood test or what was measured in your blood, the number or measurement of your result, and the unit of measure for that test, for instance, mg/dL (milligrams per deciliter). Labs set their own ranges, so the numbers on your report may differ slightly from general guidelines. The “normal” column on your results page is the right benchmark for your specific lab.
Your provider rarely reads a single CMP value alone. They look at patterns across markers, your symptoms, your medications, and your history. One mildly out-of-range result often leads to a repeat test rather than a diagnosis.
| Marker | Approximate Adult Reference Range |
|---|---|
| Glucose (fasting) | 70 to 99 mg/dL |
| BUN | 7 to 20 mg/dL |
| Creatinine (men) | 0.74 to 1.35 mg/dL |
| Creatinine (women) | 0.59 to 1.04 mg/dL |
| eGFR | ≥60 mL/min/1.73 m² |
| BUN/Creatinine Ratio | 10 to 20 |
| Sodium | 136 to 145 mEq/L |
| Potassium | 3.5 to 5.1 mEq/L |
| Chloride | 98 to 107 mEq/L |
| Carbon Dioxide | 22 to 29 mEq/L |
| Calcium | 8.5 to 10.2 mg/dL |
| Albumin | 3.4 to 5.4 g/dL |
| Total Protein | 6.0 to 8.3 g/dL |
| ALT | 7 to 56 U/L |
| AST | 10 to 40 U/L |
| ALP | 44 to 147 U/L |
| Total Bilirubin | 0.1 to 1.2 mg/dL |
Ranges are approximate and vary by lab and assay. Always use the reference range printed on your results report.
If your results are within range
All 14 measured substances in range suggests your blood sugar, kidney function, electrolyte balance, and liver enzymes are in a healthy zone at the time of the draw. That’s a useful baseline, especially if you’re starting a new medication or tracking a chronic condition.
A normal CMP doesn’t rule out every health problem. It doesn’t check thyroid function, cholesterol, blood cell counts, or vitamins. If symptoms continue, follow-up testing may look at those areas.
If one or more results are out of range
A single mildly abnormal value doesn’t mean something is seriously wrong. Dehydration can raise BUN and creatinine. A recent high-protein meal, intense exercise, or certain supplements can shift several markers too. Your provider will look at which values are off, by how much, and whether the pattern makes clinical sense.
You’ll need a blood sugar test to find out if you have prediabetes or diabetes, and testing is simple with results usually available within a few business days, especially important because prediabetes and type 2 diabetes often don’t have any symptoms. (Low-Carbohydrate Dietary Pattern on Glycemic Outcomes Trial) High glucose on a CMP may prompt your provider to order a hemoglobin A1c or repeat fasting glucose to follow up, per CDC diabetes testing guidance. High ALT or AST often prompts a repeat draw and sometimes a more detailed liver panel. Low albumin can reflect poor nutrition, liver disease, or kidney loss of protein. A high BUN/Creatinine Ratio may point to dehydration or reduced blood flow to the kidneys rather than kidney damage itself.
If results are significantly abnormal, your provider will recommend next steps. Those might include repeating the CMP, adjusting a medication, or ordering imaging or additional blood tests.
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- Private Results in a Secure Online Portal
- Thousands of CLIA-Certified U.S. Labs
- Results Typically Ready in 1 to 3 Business Days
- Upfront pricing, no surprise bills
Sources
- MedlinePlus. Comprehensive Metabolic Panel (CMP). Accessed June 2025.
- MedlinePlus. Basic Metabolic Panel. Accessed June 2025.
- Cleveland Clinic. Comprehensive Metabolic Panel (CMP): What It Is & Results. 2024.
- National Institute of Diabetes and Digestive and Kidney Diseases. Chronic Kidney Disease Tests & Diagnosis. Accessed 2025.
- National Institute of Diabetes and Digestive and Kidney Diseases. Liver Disease. Accessed 2025.
- CDC. Diabetes Testing. Accessed 2025.
- CDC. Diabetes: About Diabetes. Accessed 2025.
- National Institutes of Health Office of Dietary Supplements. Calcium: Health Professional Fact Sheet. Accessed 2025.
Frequently Asked Questions
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What is the difference between a CMP and a basic metabolic panel ?
A CMP includes the same eight tests as a BMP, plus six more tests that measure certain proteins and liver enzymes, including ALP (alkaline phosphatase), ALT (alanine transaminase), and AST (aspartate aminotransferase). Most lab reports also display calculated values derived from those measurements, such as globulin, the albumin/globulin ratio, and the BUN/creatinine ratio. Choose the CMP when liver function matters; the BMP is enough when the focus is kidneys and electrolytes.
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Does the CMP test for diabetes?
Not definitively. It includes a fasting glucose reading, which can flag high blood sugar. But a single glucose value isn’t enough to diagnose diabetes. Your provider will likely follow up with a hemoglobin A1c test or a repeat fasting glucose.
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Does the CMP include eGFR?
Yes. The estimated glomerular filtration rate (eGFR) is a calculated value that appears alongside creatinine on most CMP reports. It estimates how well your kidneys filter blood each minute, based on your creatinine level and body size. A GFR of less than 60 may mean you have kidney disease, according to the National Institute of Diabetes and Digestive and Kidney Diseases, and a result that low on repeated testing may indicate chronic kidney disease.
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What other names does the CMP go by?
It’s called Chem 14, chemistry panel, chemistry screen, and metabolic panel. The “14” refers to the 14 directly measured substances. Most lab reports also display calculated values such as globulin, the BUN/creatinine ratio, and the albumin/globulin ratio, which bring the total number of line items on a typical report to 17.
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How often should a CMP be repeated?
It depends on why it was ordered. Many people get one as part of annual preventive blood work. If you have diabetes, kidney disease, liver disease, or take medications that affect those organs, your provider may order it every three to six months. There’s no one-size-fits-all schedule.
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Can medications affect CMP results?
Yes. Statins can raise liver enzymes (ALT, AST). Diuretics can shift potassium and sodium. NSAIDs and certain antibiotics can affect creatinine and BUN. Don’t stop any medication before the test without checking with your provider. The goal is to see how your body looks on your current regimen, not off it.
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Will anyone see my results besides me?
No. Your results go to your secure online account and are not shared with anyone else. You can download or print them to share with your own doctor if you choose.
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Can I use insurance to pay for this test?
We do not bill insurance directly, which keeps your testing and results private. You can pay with HSA or FSA funds, and we can provide an itemized receipt if you want to request reimbursement.