CMP results —
14 values decoded
one by one.
Your comprehensive metabolic panel came back with a few flags and you're not sure which ones to focus on. The CMP packs 14 different measurements into one test. Here's what each one means.
Dr. James Okafor, MD, PhD
Internal Medicine, Metabolic Disease ·
The essentials — before you read the full guide below.
14 values in one draw
The CMP includes: glucose, BUN, creatinine, eGFR, sodium, potassium, chloride, CO₂, calcium, total protein, albumin, total bilirubin, ALP, and ALT. Each measures a different organ system.
Most important values to watch
Focus first on glucose (diabetes screen), eGFR/creatinine (kidney), ALT (liver), and electrolytes (sodium, potassium). These four areas cover the most significant findings.
Fasting improves glucose accuracy
Fasting isn't always required for a CMP, but the glucose result is most meaningful after 8+ hours of fasting. Non-fasting glucose above 200 mg/dL is diagnostic of diabetes.
Context determines significance
A mildly elevated ALT in someone taking statins is completely different from the same result with no known liver disease. Lab values are always interpreted with clinical context.
Reference Ranges
What does your number
actually mean?
Use the interactive slider below, or read the range cards for a full clinical breakdown.
Comprehensive Metabolic Panel (CMP) Reference Ranges
ALT (U/L) shown — see guide for full panelEnter your result
Drag to see what your Comprehensive Metabolic Panel (CMP) means
The Science
What do all 14 CMP values actually measure?
The CMP is organised into four functional groups: glucose metabolism, kidney function, liver function, and electrolyte balance. Understanding which group each value belongs to helps you know which organ system your doctor is most focused on.
Metabolic & kidney markers
Glucose screens for diabetes. BUN (blood urea nitrogen) and creatinine with eGFR assess kidney filtration function. These three together screen for the two most common metabolic diseases: diabetes and CKD.
Liver function markers
ALT is the most sensitive liver injury marker. ALP indicates bile duct or bone issues. Total bilirubin indicates liver clearance capacity. Together they distinguish hepatocellular from cholestatic liver disease.
Electrolytes show fluid balance
Sodium, potassium, chloride, and bicarbonate (CO₂) together reflect hydration status, kidney function, acid-base balance, and medication effects — including diuretics, ACE inhibitors, and ARBs.
When to Test
Signs your doctor will
order this test
These are the most common reasons a Comprehensive Metabolic Panel (CMP) test is requested — from symptoms to routine screening.
Annual wellness screening
The CMP is ordered as part of routine annual blood work for most adults over 40 — providing a broad metabolic baseline.
Routine screeningMedication monitoring
ACE inhibitors, ARBs, diuretics, statins, and metformin all affect CMP values. Regular monitoring is required for patients on these medications.
Drug monitoringAlcohol use evaluation
ALT elevation is often the first detectable sign of alcohol-related liver damage. The GGT-to-ALT ratio helps distinguish alcohol-related from other causes of elevated liver enzymes.
Liver screenDiabetes or metabolic syndrome
The CMP glucose, along with eGFR and liver enzymes, gives a broad overview of metabolic health — often used alongside HbA1c.
Metabolic screenFatigue or generalised illness
Non-specific symptoms like fatigue, nausea, and oedema often prompt a CMP to screen for kidney, liver, or electrolyte abnormalities.
Diagnostic screenPre-operative assessment
Most surgical procedures require a CMP to ensure kidney and liver function is adequate for anaesthesia and to identify electrolyte abnormalities.
Pre-op standardTesting Schedule
How often should
you get tested?
Frequency depends on your current health status and your doctor's guidance.
Healthy adults 40+
CMP is part of standard annual blood work for most adults over 40, alongside CBC, lipid panel, and HbA1c.
On ACE inhibitors/diuretics
Potassium and creatinine must be monitored regularly on these medications — potentially causing dangerous electrolyte shifts.
Acute illness
In hospital or urgent care settings, the CMP is often repeated daily to monitor electrolytes, kidney function, and hydration status.
Surgical procedures
Pre-operative CMP is standard of care. Post-operative monitoring depends on the procedure complexity and recovery.
If Your Result Is Abnormal
How to address common CMP abnormalities
Most mildly abnormal CMP values are addressed with lifestyle changes first, before medication is considered.
Fatty liver (elevated ALT)
The most effective intervention for NAFLD — the most common cause of mild ALT elevation — is 7–10% weight loss. Reduces liver fat and normalises ALT in 80% of cases.
−7 to −10% body weightElectrolyte balance (dehydration)
Adequate hydration (2–3L/day) prevents the sodium and BUN abnormalities caused by mild dehydration — one of the most common causes of an abnormal CMP in otherwise healthy adults.
Hydration firstAlcohol reduction
ALT and GGT normalise within 4–6 weeks of alcohol abstinence in most cases without underlying chronic liver disease.
Normalises in 4–6 weeksMedication review
Many prescription and OTC drugs elevate CMP values. A medication review with your doctor or pharmacist can identify drug-induced abnormalities before imaging or biopsy.
Rule out drug causes first