Comprehensive Metabolic Panel (CMP) Blood Test: Results, Normal Ranges & How to Interpret Them
Performed by: LabCorp
Key Takeaways
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A Comprehensive Metabolic Panel (CMP) measures 14 biomarkers that evaluate blood sugar, kidney function, liver health, electrolytes, and protein levels.
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Typical adult ranges include glucose ~70–99 mg/dL, creatinine ~0.6–1.3 mg/dL, sodium 135–145 mmol/L, and ALT ~7–56 U/L, although ranges vary slightly by laboratory.
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High CMP values may indicate dehydration, kidney disease, liver dysfunction, diabetes, or electrolyte imbalance.
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Low values may occur with malnutrition, overhydration, medication effects, or hormonal disorders.
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Doctors interpret patterns across the entire panel, not individual numbers in isolation.
What Is a CMP Blood Test?
A Comprehensive Metabolic Panel (CMP) is one of the most commonly ordered blood tests. It evaluates multiple aspects of metabolic and organ health by measuring markers related to blood sugar, kidney function, liver health, electrolytes, and protein balance.
Doctors frequently order a CMP during:
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routine annual physical exams
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hospital evaluations
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pre-surgery screenings
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chronic disease monitoring
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medication safety checks
Because it evaluates several body systems at once, a CMP often provides the first clues about metabolic or organ dysfunction.
What Does a CMP Measure?
A CMP includes biomarkers that can be grouped into several physiological systems.
Blood Sugar
Glucose
Glucose measures the amount of sugar circulating in the bloodstream and helps screen for prediabetes, diabetes, and metabolic dysfunction.
Kidney Function Markers
These markers evaluate how effectively the kidneys filter waste products from the blood.
Abnormal values may suggest dehydration, kidney dysfunction, reduced kidney filtration, or metabolic stress.
Electrolytes and Fluid Balance
Electrolytes help regulate hydration, nerve signaling, muscle contraction, and blood pH.
Electrolyte abnormalities may occur with dehydration, kidney disease, endocrine disorders, or medication effects.
Protein and Nutritional Markers
These markers provide insight into liver function, inflammation, and nutritional status.
Changes may reflect liver disease, inflammation, immune disorders, or protein loss.
Liver and Biliary Markers
These enzymes help detect liver cell injury or problems with bile flow.
Elevated liver enzymes may occur with fatty liver disease, hepatitis, alcohol-related liver injury, medication effects, or bile duct obstruction.
Calcium
Calcium supports bone health, nerve signaling, muscle contraction, and hormone regulation.
CMP Blood Test Markers Explained
| Marker | What it evaluates |
|---|---|
| Glucose | Blood sugar regulation |
| Blood Urea Nitrogen (BUN) | Waste product removal and kidney health |
| Creatinine | Kidney filtration efficiency |
| eGFR | Estimated kidney filtration capacity |
| BUN/Creatinine Ratio | Hydration and kidney function context |
| Sodium | Fluid balance and nerve function |
| Potassium | Heart rhythm and muscle function |
| Chloride | Fluid balance and acid-base regulation |
| CO₂ (Bicarbonate) | Blood pH balance |
| Calcium | Bone and muscle health |
| Total Protein | Overall protein status |
| Albumin | Liver synthetic function and nutrition |
| Globulin | Immune system proteins |
| Albumin/Globulin Ratio | Balance between albumin and globulin |
| Bilirubin | Red blood cell breakdown and bile flow |
| Alkaline Phosphatase | Liver or bone enzyme activity |
| AST | Liver or muscle injury marker |
| ALT | Liver cell injury marker |
Typical CMP Reference Ranges (Adults)
Reference ranges vary slightly by laboratory.
| Marker | Typical Range |
|---|---|
| Glucose | 70–99 mg/dL (fasting) |
| BUN | 7–20 mg/dL |
| Creatinine | ~0.6–1.3 mg/dL |
| eGFR | ≥90 mL/min/1.73m² |
| Sodium | 135–145 mmol/L |
| Potassium | 3.5–5.1 mmol/L |
| Chloride | 98–107 mmol/L |
| CO₂ | 22–29 mmol/L |
| Calcium | 8.5–10.5 mg/dL |
| Albumin | 3.5–5.0 g/dL |
| Total Protein | 6.0–8.3 g/dL |
| Bilirubin | 0.1–1.2 mg/dL |
| ALT | ~7–56 U/L |
| AST | ~10–40 U/L |
CMP vs Other Blood Tests
| Test | What It Measures | When It's Ordered |
|---|---|---|
| CMP | Glucose, kidney markers, liver enzymes, electrolytes, proteins | Routine screening, metabolic evaluation |
| BMP | Glucose, kidney markers, electrolytes | ER visits, hydration checks |
| CBC | Red blood cells, white blood cells, platelets | Infection, anemia |
| Lipid Panel | Cholesterol and triglycerides | Cardiovascular risk screening |
Why Doctors Order a CMP
Doctors commonly order a CMP to:
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evaluate unexplained symptoms
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monitor chronic diseases such as diabetes or kidney disease
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assess liver function
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detect electrolyte imbalances
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monitor medication safety
Medications That Can Affect CMP Results
Certain medications may influence CMP markers.
Examples include:
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Diuretics (affect sodium, potassium, BUN)
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ACE inhibitors / ARBs (may increase potassium or creatinine)
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Statins (may elevate liver enzymes)
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Steroids (increase glucose)
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NSAIDs (may affect kidney markers)
Always inform your healthcare provider about medications and supplements before interpreting results.
What High CMP Results May Mean
Elevated CMP markers may occur with:
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dehydration
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kidney dysfunction
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liver inflammation or injury
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diabetes or impaired glucose metabolism
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electrolyte imbalance
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bile duct obstruction
Interpretation depends on patterns across multiple biomarkers rather than a single abnormal result.
What Low CMP Results May Mean
Low CMP values may be associated with:
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malnutrition
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overhydration
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chronic disease
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hormonal disorders
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medication effects
Small variations are common and may be temporary.
What Should You Do if Your CMP Is Abnormal?
Step 1: Do not panic
Mild abnormalities are common and often temporary.
Step 2: Check if you were fasting
Eating before the test may affect glucose and metabolic markers.
Step 3: Review results with your doctor
Interpretation requires your medical history, medications, and symptoms.
Step 4: Consider retesting
Doctors often repeat abnormal results within 1–3 months.
Step 5: Track trends over time
Monitoring trends across multiple tests helps identify long-term changes.
CMP Results That May Require Urgent Medical Evaluation
Urgent evaluation may be needed when results are severely abnormal.
Examples include:
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Glucose <50 mg/dL or >400 mg/dL
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Potassium <3.0 or >6.0 mmol/L
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Creatinine rapidly doubling
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Bilirubin >3 mg/dL with jaundice
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Sodium <120 or >155 mmol/L
These results may indicate serious metabolic disturbances.
Frequently Asked Questions
What does a CMP blood test check for?
A CMP evaluates blood sugar, kidney function, liver health, electrolyte balance, and protein levels.
Do you need to fast for a CMP?
Many clinicians recommend fasting because glucose interpretation is more accurate.
Can a CMP detect liver disease?
A CMP can reveal patterns suggesting liver injury, but additional tests are usually needed for diagnosis.
Can a CMP detect kidney disease?
Yes. Markers such as creatinine and eGFR help evaluate kidney filtration.
Key Takeaway
A Comprehensive Metabolic Panel (CMP) provides a broad overview of metabolic and organ health.
Doctors interpret patterns across multiple biomarkers to evaluate blood sugar regulation, kidney function, liver health, electrolyte balance, and protein status.
Show more
Biomarkers included in this panel:
Adjusted Calcium
Adjusted calcium is useful in the interpretation of calcium levels when albumin levels are low. Adjusted calcium, also known as corrected calcium, is a critical marker on a Comprehensive Metabolic Panel (CMP), which is a blood test used to assess
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