What Does a Metabolic Panel Mean? Every Value Explained
A Comprehensive Metabolic Panel (CMP) is one of the most common blood tests your doctor will order. From a single draw it checks 14 different things — your blood sugar, kidney function, electrolytes, calcium and liver — and reports them as a wall of acronyms and numbers with no explanation attached.
This guide explains every value on a metabolic panel in plain English, so you know what each one measures and what a high or low result usually points to.
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What is a metabolic panel?
A metabolic panel is a group of blood tests that gives your doctor a broad snapshot of your body’s chemistry. The Comprehensive Metabolic Panel (CMP) includes 14 measurements; the Basic Metabolic Panel (BMP) is a shorter version with 8, leaving out the liver tests and some proteins.
Doctors order it at routine checkups, before starting or while on certain medications, and to keep an eye on the kidneys, liver, blood sugar and electrolytes. Because it covers so many systems at once, a single flagged value is rarely the whole story — your provider reads the panel as a picture, not a list.
Every metabolic panel value explained
Blood sugar
How much sugar is in your blood at the time of the draw.
Glucose
The amount of sugar in your blood. Fasting normal is roughly 70–99 mg/dL. High can point to prediabetes or diabetes (especially if fasting), but a recent meal, stress or illness can raise it too. Low (below about 70) can make you shaky or lightheaded.
Kidney function
Waste products your kidneys are supposed to filter out.
BUN (Blood Urea Nitrogen)
A waste product from protein that your kidneys clear. Normal is about 7–20 mg/dL. High can mean the kidneys are struggling, but also dehydration or a high-protein diet. Low is usually harmless.
Creatinine
A waste product from your muscles that the kidneys filter out. Normal is about 0.7–1.3 mg/dL for men and 0.6–1.1 mg/dL for women. High is the main flag for reduced kidney function. Your eGFR is calculated from this number.
BUN/Creatinine ratio
The two numbers compared to each other. It helps your doctor tell a kidney problem apart from simple dehydration, which raises BUN more than creatinine.
Electrolytes
The mineral salts that keep your nerves, muscles and heart working.
Sodium (Na)
The main salt in your blood, key for fluid balance. Normal is about 135–145 mmol/L. Low or high often reflects hydration, some medications, or a hormone issue rather than how much salt you eat.
Potassium (K)
A salt that is critical for your heartbeat. Normal is about 3.5–5.0 mmol/L. Both high and low potassium can affect heart rhythm, so this is one doctors watch closely.
Chloride (Cl)
A salt that moves with sodium to balance fluids and acidity. Normal is about 96–106 mmol/L. It is usually read alongside sodium and CO2 rather than on its own.
CO2 (Bicarbonate)
A measure of the acid–base balance of your blood. Normal is about 23–29 mmol/L. Abnormal levels can point to a breathing, kidney or metabolic issue.
Calcium & proteins
A key mineral and the proteins that keep fluid inside your vessels.
Calcium (Ca)
A mineral vital for bones, nerves and muscle. Normal is about 8.5–10.5 mg/dL. High can involve the parathyroid glands; low can involve vitamin D or kidney issues.
Total protein
All the proteins in your blood added together. Normal is about 6.0–8.3 g/dL. It gives a broad picture of nutrition, liver and immune activity.
Albumin
The main protein your liver makes; it keeps fluid inside your blood vessels. Normal is about 3.5–5.0 g/dL. Low can point to a liver or kidney problem, poor nutrition or inflammation.
Liver function
Enzymes and waste products that show how your liver is doing.
ALP (Alkaline Phosphatase)
An enzyme from the liver and bones. Normal is about 44–147 IU/L. High can come from the liver, the bile ducts or bone growth and healing.
ALT (Alanine Transaminase)
An enzyme found mostly in the liver. Normal is about 7–56 IU/L. High is a fairly specific sign of liver irritation or damage.
AST (Aspartate Transaminase)
An enzyme in the liver and muscles. Normal is about 10–40 IU/L. Read alongside ALT; if both are high it usually points to the liver.
Bilirubin
A yellow waste product from old red blood cells that the liver clears. Normal total is about 0.1–1.2 mg/dL. High can cause jaundice (yellowing) and points to the liver or bile ducts.
Metabolic panel abbreviations explained
A CMP report is mostly acronyms. Here is a quick reference so you can match each abbreviation to what it actually measures.
Abbreviation
Full name
What it means
GLU
Glucose
The sugar in your blood. High (fasting) can point to diabetes; low can make you shaky.
BUN
Blood Urea Nitrogen
A protein waste product your kidneys clear. High can mean kidney strain or dehydration.
CRE
Creatinine
A muscle waste product the kidneys filter. High is the main flag for kidney function.
Na
Sodium
The main salt in your blood. Reflects fluid balance more than how much salt you eat.
K
Potassium
A salt critical for your heartbeat. Watched closely — too high or low both matter.
Cl
Chloride
A salt that moves with sodium to balance fluids. Usually read alongside sodium.
CO2
Bicarbonate
Your blood’s acid–base balance. Abnormal can point to lungs, kidneys or metabolism.
Ca
Calcium
A mineral for bones, nerves and muscle. High or low both have specific causes.
TP
Total Protein
All blood proteins together — a broad look at nutrition and liver.
ALB
Albumin
The main liver protein that keeps fluid in your vessels. Low has several causes.
ALP
Alkaline Phosphatase
A liver and bone enzyme. High can come from the liver, bile ducts or bone.
ALT
Alanine Transaminase
A liver enzyme. High is a fairly specific sign of liver irritation.
AST
Aspartate Transaminase
A liver and muscle enzyme, read alongside ALT.
TBIL
Total Bilirubin
A waste product the liver clears. High can cause yellowing (jaundice).
Red flags — when to call your doctor
Most flagged values on a metabolic panel are not emergencies. A few are worth a prompt call to your provider — especially if you also feel unwell. Trust your symptoms and reach out about:
A potassium above 6.0 or below 2.5 mmol/L
A glucose above 400 or below 54 mg/dL
A sodium below 120 mmol/L
A calcium above 12 mg/dL
A creatinine that has climbed sharply since your last test
If you have severe symptoms such as chest pain, trouble breathing, fainting or confusion do not wait for a callback — call 911 or go to the nearest emergency room.
Questions to ask your doctor about your metabolic panel
1Which values on my metabolic panel are outside the normal range, and by how much?
2Is anything here urgent, or is it something we just need to keep an eye on?
3Could a medication, my diet or how hydrated I was have affected these numbers?
4Do these results change my diagnosis or treatment plan?
5When should I repeat the panel to see if anything has changed?
6What symptoms should I watch for before my next visit?
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Medical disclaimer: This page is educational and is not medical advice, diagnosis or treatment. Lab results must be interpreted by a licensed healthcare provider who knows your full history. Always follow your provider’s guidance and call 911 in an emergency.