If a complete blood count tells you about the cells floating in your blood, a blood chemistry panel reveals how well your organs are actually working. It measures dissolved molecules in plasma — enzymes, proteins, metabolic waste products, lipids, and electrolytes — that serve as signals from your liver, kidneys, pancreas, heart, and metabolic pathways.
This guide covers everything you need to know about blood chemistry testing: which marker groups exist, what each value means, which combinations matter, and how to interpret borderline results. For the detailed interpretation of specific values, see our blood chemistry panel interpretation guide.
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 (also called a metabolic panel or biochemistry panel) measures the concentration of various substances dissolved in your blood plasma. Unlike a CBC, which counts cells, chemistry panels assess organ function and metabolic health.
Common panel configurations in the US and EU:
- BMP (Basic Metabolic Panel) — 8 tests: glucose, calcium, sodium, potassium, CO2, chloride, BUN, creatinine.
- CMP (Comprehensive Metabolic Panel) — 14 tests: BMP plus albumin, total protein, ALP, ALT, AST, bilirubin.
- Lipid panel — total cholesterol, HDL, LDL, triglycerides.
- Hepatic (liver) panel — ALT, AST, ALP, GGT, bilirubin, albumin, total protein.
- Renal panel — creatinine, BUN, eGFR, electrolytes.
Major reference labs like Quest Diagnostics, LabCorp, and Synlab offer these as standard pre-configured panels, but your provider can also order individual markers.
To understand how a CBC and chemistry panel differ and when you need both, see our CBC vs metabolic panel comparison.
Liver Function Tests
The liver is the body's central processing plant — it detoxifies chemicals, metabolizes drugs, synthesizes proteins, and regulates fat metabolism. It can sustain damage silently for years, making blood testing the primary way to detect problems early.
ALT and AST: Damage Markers
ALT (alanine aminotransferase) and AST (aspartate aminotransferase) are enzymes normally found inside liver cells. When cells are damaged, these enzymes leak into the bloodstream.
Normal ranges: ALT up to 35-40 IU/L; AST up to 35 IU/L (varies by lab and sex).
- Mild elevation (up to 3x normal) — fatty liver disease (NAFLD/MASLD), mild drug-induced liver injury, chronic hepatitis.
- Marked elevation (over 10x normal) — acute hepatitis, severe toxic liver injury.
- ALT higher than AST — typical of fatty liver disease and chronic conditions.
- AST higher than ALT — typical of alcohol-related liver damage or muscle injury (AST is also present in muscle).
Bilirubin: Breakdown and Excretion
Bilirubin is a product of hemoglobin breakdown, processed by the liver.
- Total bilirubin elevated with high direct fraction — liver or bile duct obstruction.
- Total bilirubin elevated, mostly indirect — hemolysis or Gilbert syndrome (a benign inherited trait affecting up to 10% of the population).
If you notice yellowing of the whites of your eyes, particularly after fasting or fatigue, and your ALT/AST are normal, Gilbert syndrome is a likely explanation — not a disease.
GGT and Alkaline Phosphatase: Bile Ducts
- GGT (gamma-glutamyl transferase) — the most sensitive marker for alcohol use and bile duct problems. It rises within 48-72 hours of alcohol consumption.
- ALP (alkaline phosphatase) — elevated in bile duct obstruction (cholestasis) and bone disorders.
NAFLD and Metabolic Health
Non-alcoholic fatty liver disease (NAFLD), now often called MASLD, affects 25-30% of adults in the US and EU. It is closely linked to obesity and insulin resistance. The hallmark is mildly elevated ALT and AST in the absence of significant alcohol intake. The encouraging news: losing 7-10% of body weight can fully reverse early-stage fatty liver. See blood tests before weight loss for the recommended panel.
Kidney Function Markers
The kidneys filter approximately 180 liters of blood daily, removing waste products and maintaining electrolyte balance. Chemistry panels assess how effectively they perform this role.
Creatinine, BUN, and eGFR
- Creatinine — a waste product of muscle metabolism, filtered by the kidneys. Normal: men 0.7-1.3 mg/dL; women 0.6-1.1 mg/dL. Elevated creatinine indicates reduced kidney filtration.
- BUN (blood urea nitrogen) — the end product of protein metabolism. Normal: 7-20 mg/dL. Rises with kidney impairment and high-protein diets.
- eGFR (estimated glomerular filtration rate) — a calculated measure of kidney function based on creatinine, age, sex, and race. Normal: above 90 mL/min. Declining eGFR is the primary marker of chronic kidney disease.
Pay close attention to eGFR — it is more clinically meaningful than creatinine alone.
Uric Acid: Gout and Metabolism
Normal uric acid: men 3.5-7.2 mg/dL; women 2.6-6.0 mg/dL.
Elevated uric acid is associated with gout, metabolic syndrome, high-purine diets (red meat, organ meats, seafood, beer), and kidney impairment. Persistently high levels with joint pain warrant referral to a rheumatologist. Uric acid is also checked as part of blood tests for joint pain.
Complementing with Urinalysis
Chemistry panels assess the kidneys "from the inside" — via blood markers. A urinalysis checks them "from the outside" — via urine composition. These two tests are natural companions and are often ordered together.
Lipid Panel: Cardiovascular Risk
The lipid panel is your cardiovascular risk map. Guidelines from the AHA and ESC recommend lipid screening for all adults starting at age 20, with annual testing after age 40.
| Marker |
Desirable Level |
What It Shows |
| Total cholesterol |
Below 200 mg/dL |
Overall cholesterol burden |
| HDL |
Men >40 mg/dL; Women >50 mg/dL |
"Good" cholesterol — protective |
| LDL |
Below 100-130 mg/dL (goal varies by risk) |
"Bad" cholesterol — atherogenic |
| Triglycerides |
Below 150 mg/dL |
Blood fats, linked to metabolic health |
High triglycerides combined with low HDL almost always accompany insulin resistance and abdominal obesity — a constellation known as metabolic syndrome, the precursor to type 2 diabetes.
Lipid testing is a mandatory component of an annual health checkup for adults over 35-40.
Preparation matters: 12 hours without food, 72 hours without alcohol. Otherwise, triglycerides may be falsely elevated 2-3 times over, rendering the entire panel useless.
Glucose and Diabetes Markers
- Fasting glucose: normal 70-99 mg/dL (3.9-5.5 mmol/L).
- 100-125 mg/dL — impaired fasting glucose (prediabetes).
- 126 mg/dL or higher (confirmed on two occasions) — diabetes.
- HbA1c (glycated hemoglobin): normal below 5.7%.
- 5.7-6.4% — prediabetes.
- 6.5% or higher — diabetes.
- Fasting insulin with HOMA-IR calculation — assesses insulin resistance.
HbA1c reflects average blood sugar over the past 2-3 months and is far more informative than a single fasting glucose measurement. For the full diabetes monitoring panel, see diabetes monitoring blood tests.
Proteins: Nutrition and Inflammation
Total Protein and Albumin
- Total protein: 6.4-8.3 g/dL. Low levels suggest malnutrition, liver disease, kidney protein loss, or chronic inflammation.
- Albumin: 3.5-5.2 g/dL. The most abundant plasma protein, synthesized by the liver. Low albumin is a marker of liver disease, nephrotic syndrome, or prolonged inadequate nutrition.
CRP: The Inflammation Signal
C-reactive protein (CRP) is the primary marker of acute inflammation. Normal: below 0.5 mg/dL (5 mg/L).
- CRP above 1.0 mg/dL — active infection, autoimmune flare, post-surgical inflammation.
- CRP above 5.0 mg/dL — serious infection or inflammation requiring medical evaluation.
- High-sensitivity CRP (hs-CRP) of 1-3 mg/L — low-grade chronic inflammation, an independent cardiovascular risk factor.
Electrolytes and Minerals
Essential Electrolytes
- Potassium (3.5-5.0 mEq/L) — critical for heart rhythm. Both low (hypokalemia) and high (hyperkalemia) levels are dangerous and can cause arrhythmias.
- Sodium (136-145 mEq/L) — governs fluid balance.
- Calcium (8.5-10.5 mg/dL) — essential for bones, nerve function, and muscle contraction.
- Magnesium (1.7-2.2 mg/dL) — involved in nerve transmission, sleep regulation, and cardiac rhythm.
Electrolyte imbalances can cause a wide range of symptoms including headaches, muscle cramps, and fatigue. They are routinely included in blood tests for headaches and fatigue workups.
Iron and Ferritin
- Serum iron: men 65-175 mcg/dL; women 50-170 mcg/dL. Fluctuates throughout the day.
- Ferritin: 30-400 ng/mL. The best single marker of iron stores.
Subclinical iron deficiency often begins when ferritin drops below 50 ng/mL — this is clinically significant, especially in women experiencing fatigue or hair loss.
Pancreatic and Tissue Enzymes
- Amylase — a pancreatic enzyme. Marked elevation indicates acute pancreatitis.
- Lipase — more specific to the pancreas than amylase.
- LDH (lactate dehydrogenase) — a general marker of cellular damage across liver, heart, muscle, and red blood cells.
- CK (creatine kinase) — a muscle and heart enzyme. Elevated after intense exercise, in myocarditis, and after myocardial infarction.
- CK-MB — the cardiac-specific fraction of CK.
Coagulation Panel
A coagulation panel (often ordered alongside chemistry) includes:
- PT/INR (prothrombin time / international normalized ratio) — extrinsic clotting pathway.
- aPTT (activated partial thromboplastin time) — intrinsic pathway.
- Fibrinogen — the protein precursor of blood clots.
- D-dimer — a marker of recent or ongoing thrombosis.
This panel is standard in pre-surgery blood tests, pregnancy monitoring, and anticoagulant therapy management.
How to Read Your Chemistry Panel
The main challenge is not reading individual values but understanding their combinations:
- ALT and AST elevated + GGT elevated + BMI over 28 = fatty liver disease.
- Creatinine elevated + eGFR below 90 = early kidney impairment.
- High triglycerides + glucose 105 mg/dL + high fasting insulin = insulin resistance.
- Total bilirubin elevated (mostly indirect) + normal ALT = Gilbert syndrome, not disease.
- Elevated calcium = check parathyroid hormone and vitamin D.
Isolated borderline values are common and often resolve on repeat testing. Patterns across multiple markers are what drive clinical decisions.
When to See a Doctor
Consult your primary care provider or a specialist if your chemistry panel shows:
- ALT or AST more than 2x the upper limit — gastroenterologist or hepatologist.
- Elevated creatinine with declining eGFR — nephrologist.
- Fasting glucose above 100 mg/dL + HbA1c above 5.7% — endocrinologist for prediabetes evaluation.
- Uric acid elevated with joint pain — rheumatologist.
- LDL above 160 mg/dL or lower with cardiovascular risk factors — cardiologist.
- CRP above 2.0 mg/dL without obvious infection — investigate the source of inflammation.
- Low ferritin with fatigue — your PCP can start iron supplementation.
For healthy individuals with minor isolated deviations, repeating the test in 2-4 weeks under proper conditions is usually the right first step.
Get Your Results Interpreted
Blood chemistry can be complex — but you do not need to decode it alone. If you have a metabolic panel and want a clear explanation of every value and how they connect, upload your results at Evallume for an instant AI-powered interpretation tailored to your age and sex.
This article is for informational purposes only. It does not constitute medical advice, diagnosis, or treatment. Consult a healthcare professional for any medical concerns.
