Blood Chemistry Panel Interpretation: Liver, Kidney, Glucose, and Lipid Markers

A blood chemistry panel — also known as a comprehensive metabolic panel (CMP) or biochemistry profile — is one of the most informative tests in modern medicine. A single blood draw can assess the health of your liver, kidneys, metabolism, electrolyte balance, and cardiovascular system.

This guide walks you through every major marker on a standard blood chemistry panel, explains international reference ranges, and helps you understand what abnormal values may signal.

Disclaimer: This information is for educational purposes only and does not replace professional medical advice. Always consult a qualified healthcare provider for diagnosis and treatment.

What Is a Blood Chemistry Panel?

A blood chemistry panel measures the concentrations of various substances in your blood serum. These substances include enzymes, metabolites, electrolytes, and proteins that reflect the function of specific organs and metabolic processes.

There are two standard versions:

• Basic Metabolic Panel (BMP) — 8 tests: glucose, calcium, sodium, potassium, chloride, bicarbonate (CO2), BUN, creatinine.
• Comprehensive Metabolic Panel (CMP) — BMP + liver markers: ALT, AST, ALP, bilirubin, albumin, total protein.

Many labs also include a lipid panel (cholesterol, triglycerides) and additional markers like uric acid, iron, and LDH. The exact composition varies by lab and clinical indication.

Preparation for the Test

For the most accurate results:

• Fast for 8–12 hours before the blood draw. Glucose, triglycerides, and some other markers are significantly affected by recent food intake.
• Stay hydrated — drink water normally. Dehydration can falsely elevate kidney markers and electrolytes.
• Avoid alcohol for at least 24 hours before testing — it directly affects liver enzymes.
• Inform your doctor about all medications — many drugs can alter chemistry panel results.

Glucose: Blood Sugar

Fasting glucose normal range: 3.9–5.6 mmol/L (70–100 mg/dL)

Glucose is your body's primary energy source. Its regulation depends on the balance between insulin (which lowers glucose) and counter-regulatory hormones (which raise it).

• Impaired fasting glucose (5.6–6.9 mmol/L / 100–125 mg/dL) — prediabetes. This is a warning stage where lifestyle changes can prevent progression to diabetes.
• Diabetes (≥7.0 mmol/L / ≥126 mg/dL on two separate tests) — requires medical management.
• Low glucose (<3.9 mmol/L) — hypoglycemia. Can cause confusion, shakiness, sweating, and in severe cases, loss of consciousness. Most commonly seen as a side effect of diabetes medications.

For diabetes monitoring, HbA1c (glycated hemoglobin) provides a 3-month average of blood glucose control (normal: <5.7%).

Liver Function Tests

The liver performs over 500 functions, including detoxification, protein synthesis, and bile production. Several enzymes and proteins on the chemistry panel reflect liver health.

ALT (Alanine Aminotransferase)

Normal: 7–56 U/L (men), 7–45 U/L (women)

ALT is the most liver-specific enzyme. It is released into the blood when liver cells are damaged. Elevated ALT is the earliest and most sensitive marker of liver injury.

Common causes of elevated ALT:

• Non-alcoholic fatty liver disease (NAFLD) — the most common cause in developed countries.
• Viral hepatitis (A, B, C) — can cause dramatic elevations (>1000 U/L).
• Alcohol-related liver disease.
• Medications — statins, acetaminophen (paracetamol), certain antibiotics.

AST (Aspartate Aminotransferase)

Normal: 10–40 U/L

AST is found in the liver, heart, muscles, and kidneys. It is less liver-specific than ALT but is useful in combination.

• AST/ALT ratio >2 suggests alcohol-related liver disease.
• AST/ALT ratio <1 is typical of viral hepatitis or NAFLD.
• Isolated AST elevation may indicate muscle damage, heart injury, or intense exercise.

ALP (Alkaline Phosphatase)

Normal: 44–147 U/L

ALP is found in the liver, bones, kidneys, and intestines. Elevated ALP may indicate:

• Bile duct obstruction — gallstones, tumors.
• Bone disease — fractures, Paget's disease, bone metastases.
• Normal in children and adolescents — growing bones produce more ALP.

GGT (Gamma-Glutamyl Transferase)

Normal: 0–45 U/L (men), 0–30 U/L (women)

GGT is a sensitive marker for bile duct problems and alcohol consumption. It helps distinguish whether elevated ALP is from liver or bone origin (GGT rises with liver-related ALP elevation but not with bone disease).

Bilirubin

Total bilirubin normal: 3.4–17.1 µmol/L (0.2–1.0 mg/dL)

Bilirubin is a yellow pigment produced when red blood cells break down. The liver processes bilirubin and excretes it in bile.

• Elevated total bilirubin — may cause jaundice (yellowing of skin and eyes).
• Unconjugated (indirect) bilirubin — elevated in hemolytic anemia (excessive red cell destruction) or Gilbert's syndrome (a harmless genetic condition affecting ~5% of the population).
• Conjugated (direct) bilirubin — elevated in liver disease or bile duct obstruction.

Kidney Function Tests

Creatinine

Normal: 62–106 µmol/L (0.7–1.2 mg/dL) for men; 44–80 µmol/L (0.5–0.9 mg/dL) for women

Creatinine is a waste product of muscle metabolism, filtered exclusively by the kidneys. It is the most widely used marker of kidney function.

• Elevated creatinine suggests impaired kidney filtration. Causes include chronic kidney disease, dehydration, medications (NSAIDs, certain antibiotics), and urinary obstruction.
• Low creatinine may indicate low muscle mass or liver disease.

Creatinine is used to calculate the eGFR (estimated Glomerular Filtration Rate), which stages kidney function:

BUN (Blood Urea Nitrogen)

Normal: 2.5–7.1 mmol/L (7–20 mg/dL)

BUN is another waste product filtered by the kidneys. Unlike creatinine, BUN is also affected by protein intake, dehydration, and liver function, making it less specific.

• BUN/Creatinine ratio helps distinguish prerenal (dehydration) from intrinsic kidney disease.

Uric Acid

Normal: 202–416 µmol/L (3.4–7.0 mg/dL) for men; 143–339 µmol/L (2.4–5.7 mg/dL) for women

Uric acid is the end product of purine metabolism. Elevated levels can lead to:

• Gout — painful crystal deposits in joints.
• Kidney stones — uric acid stones.
• Metabolic syndrome — often elevated alongside glucose and lipid abnormalities.

Electrolytes

Electrolytes maintain fluid balance, nerve function, and muscle contraction.

Sodium (Na)

Normal: 136–145 mmol/L

• Low sodium (hyponatremia) — excessive fluid intake, heart failure, SIADH, diuretics. Severe cases cause confusion and seizures.
• High sodium (hypernatremia) — dehydration, diabetes insipidus. Causes thirst and neurological symptoms.

Potassium (K)

Normal: 3.5–5.1 mmol/L

Potassium is critical for heart rhythm. Both extremes are dangerous:

• Low potassium (<3.5) — muscle weakness, cramps, arrhythmias. Common with diuretic use.
• High potassium (>5.1) — potentially life-threatening arrhythmias. Seen in kidney disease, certain medications (ACE inhibitors, potassium-sparing diuretics).

Calcium (Ca)

Normal: 2.15–2.55 mmol/L (8.6–10.2 mg/dL)

• High calcium — hyperparathyroidism, malignancy, vitamin D excess.
• Low calcium — vitamin D deficiency, hypoparathyroidism, kidney disease.

Calcium levels are closely tied to thyroid and parathyroid function.

Lipid Panel: Cardiovascular Risk

Total Cholesterol

Desirable: < 5.2 mmol/L (< 200 mg/dL)

LDL Cholesterol ("Bad" Cholesterol)

Optimal: < 2.6 mmol/L (< 100 mg/dL)

LDL deposits cholesterol in artery walls, driving atherosclerosis and increasing heart attack and stroke risk. Target levels vary based on individual cardiovascular risk factors.

HDL Cholesterol ("Good" Cholesterol)

Desirable: > 1.0 mmol/L (> 40 mg/dL) for men; > 1.3 mmol/L (> 50 mg/dL) for women

HDL removes excess cholesterol from arteries and transports it to the liver for disposal.

Triglycerides

Normal: < 1.7 mmol/L (< 150 mg/dL)

Triglycerides are the main form of fat storage in the body. Elevated levels (especially >2.3 mmol/L) increase cardiovascular risk and are strongly influenced by diet, alcohol, and obesity.

Protein Markers

Total Protein

Normal: 60–83 g/L

Reflects the sum of albumin and globulins. Low levels may indicate malnutrition, liver disease, or kidney loss. High levels can occur in chronic infections, autoimmune disease, or multiple myeloma.

Albumin

Normal: 35–52 g/L

Albumin is the most abundant blood protein, produced by the liver. Low albumin suggests liver disease, malnutrition, nephrotic syndrome, or chronic inflammation.

Connecting the Dots

Chemistry panel results rarely stand alone. They are most valuable when interpreted alongside:

• Complete blood count — anemia patterns, infection markers.
• Urinalysis — protein and glucose in urine confirm kidney findings.
• Thyroid panel — thyroid dysfunction affects cholesterol, glucose, and liver enzymes.
• Infection screening — viral infections (hepatitis) are a key cause of abnormal liver markers.

When to Be Concerned

Seek medical attention if your results show:

• Fasting glucose ≥ 7.0 mmol/L — possible diabetes.
• ALT or AST > 3× upper limit — significant liver injury requiring investigation.
• Creatinine significantly above normal — impaired kidney function.
• Potassium > 5.5 or < 3.0 mmol/L — electrolyte emergency risk.
• LDL > 4.9 mmol/L — high cardiovascular risk requiring treatment.

Get Your Chemistry Panel Interpreted

A blood chemistry panel contains dozens of values that interact in complex ways. For a clear, personalized explanation of your results, upload your lab report at Evallume — our AI analyzes every marker with your age and sex in mind.

This article is for informational purposes only. It does not constitute medical advice, diagnosis, or treatment. Consult a healthcare professional for any medical concerns.