What Is a Comprehensive Metabolic Panel (CMP)? All 14 Tests Explained
Written by &you Labs Team
Updated
A comprehensive metabolic panel, or CMP, is one of the most common blood tests doctors order. It checks 14 different things in your blood with a single draw. Think of it as a report card for your blood sugar, your kidneys, your liver, your salts, and your protein levels all at once.
This guide breaks down all 14 tests in plain words. You will learn what each one measures, what a normal result looks like, and what a high or low result can mean.
Quick answer
A comprehensive metabolic panel (CMP) is a blood test with 14 parts. It checks blood sugar, kidney health, liver health, four body salts (called electrolytes), and protein levels. It builds on the smaller 8-test basic metabolic panel by adding tests for your liver and protein. Doctors use it as a routine check during physicals, sickness, and hospital stays.
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The 14 tests, explained simply
The table below lists what each test measures and its normal range. Ranges can shift slightly between labs, so always check the range printed on your own report.
Test | What it checks | Normal range |
|---|---|---|
Glucose | Your blood sugar right now | 70 to 99 mg/dL after fasting (no food for 8 to 12 hours) |
BUN (blood urea nitrogen) | A waste product your kidneys clear out | 7 to 20 mg/dL |
Creatinine | A waste product from your muscles, cleared by your kidneys | 0.7 to 1.3 mg/dL (men), 0.6 to 1.1 mg/dL (women) |
eGFR | A calculated score for how well your kidneys filter blood | 60 mL/min/1.73m squared or higher |
Sodium | A salt that controls your body's fluid balance | 136 to 145 mEq/L |
Potassium | A salt your heart needs for a steady rhythm | 3.5 to 5.0 mEq/L |
Chloride | A salt that works alongside sodium | 96 to 106 mEq/L |
CO2 (bicarbonate) | A buffer that keeps your blood's acid level steady | 22 to 29 mEq/L |
Calcium | A mineral for your bones, muscles, and nerves | 8.5 to 10.5 mg/dL |
Total protein | All the proteins in your blood added together | 6.0 to 8.3 g/dL |
Albumin | The main protein your liver makes | 3.5 to 5.0 g/dL |
ALT | A liver enzyme, meaning a protein that speeds up a body process | Men under 40 U/L, women under 33 U/L |
AST | A second liver and muscle enzyme | Men under 40 U/L, women under 32 U/L |
ALP (alkaline phosphatase) | An enzyme from your liver, bones, and gut | 44 to 147 U/L |
A 15th value, total bilirubin, is often reported alongside these 14. It measures a substance made when your body breaks down old red blood cells. The normal range is 0.1 to 1.2 mg/dL.
What glucose tells you
Glucose is your blood sugar at the exact moment of the draw. A fasting result of 100 to 125 mg/dL points to prediabetes. That is a stage where your blood sugar is higher than normal but not yet diabetes. A fasting result of 126 mg/dL or higher, confirmed on a second test, points to diabetes. You must fast for this number to mean anything. Fasting means no food for 8 to 12 hours. If you want a 3-month average instead of one moment, ask about an HbA1c test.
What BUN and creatinine tell you
Both are waste products. Healthy kidneys clear them from your blood. When kidneys slow down, these numbers climb. Creatinine is the more reliable of the two. A high-protein meal or mild dehydration can nudge BUN up without any real kidney problem.
What eGFR tells you
eGFR stands for estimated glomerular filtration rate. It is a number your doctor calculates from your creatinine, age, and sex. It estimates how many milliliters of blood your kidneys filter each minute. A score of 60 or higher is normal. A score of 30 to 59 suggests moderate kidney disease. A score under 30 suggests severe kidney disease. One low reading is not proof of a problem. Doctors usually repeat the test to confirm a trend.
What sodium, potassium, chloride, and CO2 tell you
These four are your electrolytes. Electrolytes are salts your body uses to move fluid, fire nerves, and beat your heart. Sodium and chloride mostly track your hydration and hormone balance. Potassium is watched closely. Both high and low levels can throw off your heart rhythm. CO2 is also called bicarbonate. It shows if your blood is too acidic or too alkaline, meaning the opposite of acidic. Your body keeps these numbers in a tight, narrow range. Even a small shift can matter.
What calcium tells you
Calcium supports your bones, muscles, and nerves. A high or low result can point to a few things. It may mean a bone problem, a parathyroid gland issue (the parathyroid gland controls calcium), a vitamin D shortage, or kidney disease. If your albumin is abnormal, your doctor uses a corrected calcium formula for an accurate picture.
What total protein and albumin tell you
Total protein adds up every protein in your blood. Albumin is the biggest single piece of that total. Your liver makes it. Low albumin can point to poor nutrition, liver trouble, or kidney protein loss. It can also point to ongoing inflammation, your body's response to injury or irritation. Research links low albumin to a shorter lifespan. That is why doctors watch this number closely over time.
What ALT, AST, and ALP tell you
ALT and AST are liver enzymes. When liver cells get damaged, they leak these enzymes into your blood. So the numbers rise. ALT is the more liver-specific of the two. AST also comes from muscle and the heart. A high AST alone does not always mean a liver problem. When AST is more than twice as high as ALT, it often points to liver damage from alcohol. When the ratio is under 1, it more often points to fatty liver disease.
ALP comes from your liver, bones, gut, and, during pregnancy, the placenta. A high ALP can mean a blocked bile duct, a bone condition, or pregnancy. A separate liver enzyme test called GGT can help show if a high ALP is coming from the liver or the bones.
What a CMP does not cover
A CMP is wide, but it is not complete. It skips a few key areas. These include your blood cell counts, your cholesterol, your 3-month blood sugar average called HbA1c, your thyroid, your vitamin D, your iron levels, and markers of inflammation. That is why a full wellness panel pairs the CMP with these other categories. Together they give a fuller picture of your health.
CMP versus BMP
The CMP grew out of a smaller, 8-test panel called the basic metabolic panel, or BMP. The BMP covers glucose, kidney function, and electrolytes. The CMP adds liver enzymes, total protein, and albumin on top of that. See the Related reading list below for guides that explain the BMP, and kidney and liver testing, on their own.
If you would like your own 14 numbers checked, you can book a &you Labs panel whenever it suits you.
Common result patterns
Doctors rarely look at one number alone. They look for patterns across the panel.
Pattern | What it usually means |
|---|---|
Everything in range | Your metabolism is working well. Keep up your habits and recheck yearly. |
High glucose | Possible prediabetes or diabetes. An HbA1c test confirms it. |
High creatinine, low eGFR | Reduced kidney function. Your doctor will repeat the test and look for a cause. |
High ALT and AST | Liver injury. Your doctor will look at fatty liver, alcohol use, or infection as causes. |
Low sodium | Several causes, from mild (diet, medication) to more significant. Needs a doctor's review. |
Low albumin | Can point to liver trouble, kidney loss, poor nutrition, or inflammation. |
How to get ready for a CMP
Fast for 8 to 12 hours before the draw, since food changes your glucose result. Water is fine to drink. Stay well hydrated, since dehydration can throw off your creatinine and electrolyte numbers. Keep taking your regular medications unless your doctor tells you otherwise. Share any medications, supplements, recent illness, or hard exercise before the draw. Morning testing works best, and testing at a similar time each year makes it easier to compare your results.
Once your results are in, a comprehensive test like the full &you Labs biomarker panel pairs your CMP with the other markers doctors use to build the complete health picture, plus a written plan for what to do next.
You do not need to wait for a symptom to check these 14 numbers. Many people book a panel simply to see where they stand today, and seeing your own results gives you a clear starting point to work from.
Frequently asked questions
Do I need to fast for a CMP?
Yes. Fast for 8 to 12 hours so your glucose reading is accurate. Water is fine during that time.
What is the difference between a CMP and a CBC?
A CMP checks your body chemistry, like organ function and blood sugar. A CBC (complete blood count) checks your blood cells instead. Comprehensive panels usually include both.
Is a CMP enough for a yearly checkup?
It is a strong start, but not the full picture. For a complete yearly check, pair it with a blood cell count, a cholesterol test, an HbA1c test, a thyroid test, a vitamin D test, and an inflammation marker.
What if one number on my CMP is abnormal?
One number often means little on its own, especially if it is only slightly outside the range. Your doctor will look at the whole pattern and may ask for a repeat test to confirm before deciding on next steps.
How often should I get a CMP?
Most healthy adults get one once a year. People managing an ongoing health condition often need it more often.
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Key takeaways
- A CMP is 14 blood tests that cover your blood sugar, kidneys, liver, salts, and protein levels.
- Each test has its own normal range and its own meaning.
- A CMP does not cover everything. Pair it with a blood cell count, cholesterol test, HbA1c, thyroid test, and more for a full picture.
- Doctors read patterns across several numbers, not just one number alone.
- Fasting and testing at a similar time each year make your results easier to compare.
The &you Labs Team combines medical science with personal care. We help Filipinos understand their health markers with blood work analysis that is easy to follow, whole person support, and health expertise built for Filipino life.
This content is provided for educational purposes only and is not intended as medical advice. It should not replace professional medical consultation, diagnosis, or treatment. Please consult a qualified healthcare provider to discuss the risks and benefits of any treatment option.
