Other Names for the Test

Complete Metabolic Panel

Chemistry Screen

Chem-14

What is a Comprehensive Metabolic Panel (CMP) Test?

The Comprehensive Metabolic Panel (CMP) test is a blood test that provides important information about the body’s chemical balance, metabolism, and organ function, particularly liver and kidney health. The CMP measures:

• Electrolytes: Sodium, potassium, chloride, and bicarbonate, which help regulate nerve and muscle functions.
• Proteins: Albumin and total protein, essential for muscle repair and immune health.
• Liver Enzymes: Alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), and bilirubin, which indicate liver function.
• Kidney Function Markers: Blood urea nitrogen (BUN) and creatinine, which show how well kidneys are filtering waste.
• Glucose: Blood sugar levels, which are important for energy.

When Should I Book a Comprehensive Metabolic Panel Test?

Consider booking a CMP test if you experience:

• Symptoms of liver or kidney disease, such as jaundice, fatigue, or swelling
• Persistent nausea, vomiting, or abdominal pain
• Changes in blood pressure, heart rate, or hydration levels
• Need to monitor chronic conditions like diabetes or high blood pressure
• Routine health check-up, especially before surgery or as part of annual exams

What Preparations Are Required Before Taking the Test?

For accurate CMP results, follow these preparations:

• Fasting: Avoid eating or drinking (except water) for 8-12 hours before the test, as food can alter glucose and liver enzyme levels.
• Medication: Inform your doctor of any medications, as some may affect CMP results.
• Hydration: Stay hydrated to make blood collection easier and reduce potential lightheadedness.

What Will Happen During the Comprehensive Metabolic Panel Test?

The CMP test involves a standard blood draw:

• A healthcare provider cleans your arm’s skin.
• A needle is inserted into a vein to collect a small blood sample.
• The sample is sent to a lab for analysis.
• The procedure only takes a few minutes, and you can continue your day as usual afterward.

What is the Normal Range for a Comprehensive Metabolic Panel?

Typical CMP values include:

Sodium: 135-145 mmol/L

Potassium: 3.5-5.0 mmol/L

Chloride: 98-106 mmol/L

Bicarbonate (CO₂): 23-29 mmol/L

Blood Urea Nitrogen (BUN): 7-20 mg/dL

Creatinine: 0.6-1.2 mg/dL (men); 0.5-1.1 mg/dL (women)

Glucose: 70-100 mg/dL (fasting)

Calcium: 8.5-10.2 mg/dL

Total Protein: 6.0-8.3 g/dL

Albumin: 3.5-5.0 g/dL

ALT (Alanine Aminotransferase): 7-55 U/L

AST (Aspartate Aminotransferase): 8-48 U/L

ALP (Alkaline Phosphatase): 40-129 U/L

Bilirubin: 0.1-1.2 mg/dL

What Do the Results Mean?

High Levels (Hyper)

• Sodium: Possible dehydration or kidney disease
• Potassium: Kidney dysfunction or medication effects
• Bilirubin and Liver Enzymes (ALT, AST, ALP): Potential liver damage or disease
• Glucose: Hyperglycemia, possibly indicating diabetes
• BUN/Creatinine: Kidney dysfunction or dehydration

Low Levels (Hypo)

• Sodium: Overhydration, heart failure, or kidney disease
• Potassium: Fluid loss from vomiting or certain medications
• Albumin and Total Protein: Liver disease or malnutrition
• Glucose: Hypoglycemia, due to insulin overdose or other metabolic disorders

When Should I Call My Doctor?

Contact your doctor if:

• Your results show abnormal values, particularly in liver enzymes, electrolytes, or glucose levels.
• You have concerning symptoms like yellowing of the skin, extreme fatigue, or swelling.
• You need advice on adjusting your lifestyle or medication based on the results.

How Frequently Should I Take the Comprehensive Metabolic Panel Test?

Routine Check-Up: Once a year or as part of a standard health screening.

Chronic Conditions: More frequently if you have conditions like liver disease, kidney disease, or diabetes.

Post-Treatment or Medication Change: After significant changes in treatment plans or medications that impact liver or kidney function.