Liver Function Panel (Hepatic Panel)
Comprehensive blood test evaluating liver health through measurement of enzymes, proteins, and bilirubin levels to detect liver disease, damage, or dysfunction.
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What this test measures
The Liver Function Panel is a comprehensive blood test that includes total protein, albumin, globulin (calculated), albumin/globulin ratio, total bilirubin, direct bilirubin, indirect bilirubin (calculated), alkaline phosphatase (ALP), aspartate aminotransferase (AST), and alanine aminotransferase (ALT). ALT, AST, ALP, and bilirubin are common liver chemistry analytes that can be used to evaluate liver injury. These biomarkers work together to provide a complete picture of liver function and health status.
ALT is a more liver-specific marker than AST. The latter also is present in the peripheral circulation during episodes of skeletal, cardiac, and smooth muscle injury. Elevated ALT and AST levels disproportionate to ALP levels indicate hepatocellular injury; elevated ALP and bilirubin levels disproportionate to ALT and AST levels indicate cholestatic injury. Albumin is a marker of liver synthetic function; low levels may indicate liver disease of more than 3 weeks' duration. Total protein levels reflect the sum of albumin and globulins and may aid in the diagnosis of disorders involving the liver, kidney, or bone marrow.
What's included
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals with symptoms of liver disease such as jaundice, unexplained fatigue, abdominal pain, or nausea
- Those with risk factors for liver disease including excessive alcohol consumption, obesity, or diabetes
- People taking medications that may affect liver function or those exposed to hepatitis viruses
- Individuals monitoring existing liver conditions or following up on previous abnormal liver test results
- Those with family history of liver disease or genetic conditions affecting the liver
- People seeking routine health screening to assess overall liver function and detect early liver problems
What to expect
Preparation
The test may be more accurate if individuals fast for 10 to 12 hours beforehand. Most healthcare providers recommend fasting, though some tests can be performed without fasting. Individuals should inform their healthcare provider about all medications, supplements, and herbal products they are taking, as these can affect liver enzyme levels.
Sample Type
The test requires a blood sample collected in a serum (preferred) or plasma tube, with a volume of 1 mL (minimum 0.5 mL). Collection uses a red-top tube, gel-barrier tube, or green-top (heparin) tube.
Collection
At the laboratory or collection site, a healthcare professional will draw blood from a vein, typically in the arm. The process takes just a few minutes and involves minimal discomfort. The sample is then processed and analyzed using automated laboratory equipment.
Turnaround
Results are typically available within 1-2 business days. Some laboratories may offer same-day results for urgent cases, while routine testing generally provides results the next business day.
Understanding your results
Liver function test results are interpreted as a panel rather than individual values, as the pattern of abnormalities provides more diagnostic information than isolated elevated markers. Elevations in ALT and AST in out of proportion to ALP, and bilirubin denotes a hepatocellular disease. An elevation in ALP and bilirubin in disproportion to ALT and AST would characterize a cholestatic pattern. A mixed injury pattern is defined as an elevation of alkaline phosphatase and AST/ALT levels.
In the absence of identifiable risk factors, ALT or AST levels above the upper limit of the normal range are associated with increased liver-related mortality. Evaluation of direct and indirect bilirubin levels is helpful for assessing the possibility of hepatocellular disease. Elevated direct bilirubin levels imply hepatocellular dysfunction or cholestasis.
| Population | Reference Range | Notes |
|---|---|---|
| Adults | ALT: 0-40 U/L, AST: 0-35 U/L | Liver enzyme levels may vary slightly based on gender, age, and laboratory |
| Adults | Alkaline Phosphatase: 30-120 U/L | ALP levels can be elevated in bone disease as well as liver conditions |
| Adults | Total Bilirubin: 0.1-1.2 mg/dL | Elevated levels may indicate liver dysfunction or bile duct obstruction |
| Adults | Albumin: 3.5-5.0 g/dL, Total Protein: 6.0-8.0 g/dL | Reflects liver's synthetic function and overall protein status |
Reference ranges shown are general guidelines. Your lab report will include the specific reference range used by the laboratory that processed your sample, which is the authoritative range for interpreting your results.
What does a “Low” result mean?
Low levels of certain markers may also provide important clinical information. Albumin is a marker of liver synthetic function; low levels may indicate liver disease of more than 3 weeks' duration. Decreased albumin and total protein levels can suggest chronic liver disease, malnutrition, or other conditions affecting protein synthesis. Low albumin levels may be associated with advanced liver disease, where the liver's ability to produce essential proteins is compromised. However, low liver enzyme levels are generally not concerning and may simply reflect normal individual variation. It's important to consider these results in context with other laboratory values and clinical symptoms.
What does a “High” result mean?
Elevated liver enzymes may indicate various forms of liver injury or disease. Elevated ALT and AST levels disproportionate to ALP levels indicate hepatocellular injury; elevated ALP and bilirubin levels disproportionate to ALT and AST levels indicate cholestatic injury. High ALT and AST levels can be associated with conditions such as viral hepatitis, fatty liver disease, medication-induced liver injury, or autoimmune liver disease. An AST-to-ALT ratio greater than 2:1 strongly suggests alcohol-related liver disease, while ratios less than 1 typically indicate non-alcoholic causes like viral hepatitis or drug-induced injury. Very high levels of both enzymes (>1000 IU/L) often indicate acute liver injury from toxins, medications, or severe viral infections. Elevated bilirubin levels may suggest problems with bile flow or liver processing of waste products.
Privacy & confidentiality
All test orders are authorized and results reviewed by an independent, board-certified physician who is not the patient's personal doctor. Your liver function panel results are completely confidential and protected by strict medical privacy laws. The results are <u>not reported to your doctor</u> unless you specifically choose to share them, and they are <u>not part of your medical records</u> maintained by your healthcare provider. This testing is also <u>not on insurance statements</u> or explanation of benefits (EOB), ensuring complete financial privacy. LevelPanel uses secure, HIPAA-compliant systems to protect your health information. Your test results are only accessible to you through your secure online account, and no doctor visit is required to order this test. The laboratory processes your sample with the same high standards used for physician-ordered tests, but the results come directly to you. This confidential approach allows individuals to monitor their liver health privately, whether for routine wellness screening or when concerned about potential liver issues. Your employer, insurance company, and healthcare providers will have no knowledge of your testing unless you choose to share the results with them.
Frequently asked questions
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CPT Code: 80076
This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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