Liver Function Test (LFT)

LFT Test (Liver Function Test)

A Liver Function Test (LFT), also known as a hepatic panel, is a group of blood tests used to evaluate how well your liver is working. The panel measures the levels of specific proteins, liver enzymes, and waste products in your bloodstream to screen for liver damage, disease, or inflammation.

How an LFT Test Works

• Simple Blood Sample Collection: A healthcare professional uses a small needle to draw blood from a vein in your arm.

• Biomarker Concentration Measurement: Laboratory instruments isolate blood serum to measure specific proteins, enzymes, and metabolic waste products.

• Multi-Factorial Organ Evaluation: Automated systems compare enzyme release and protein synthesis against baseline medical reference ranges.

Why an LFT Test Is Done (Indications)

• Liver Disease Screening: Detects early signs of hepatitis, fatty liver disease, liver cirrhosis, or gallbladder issues.

• Medication Safety Monitoring: Tracks how potential liver-altering medications affect hepatic tissue over time.

• Symptom Evaluation: Investigates unexplained physical signs like jaundice (yellowing of eyes and skin), dark urine, abdominal pain, or nausea.

• Alcohol & Metabolic Impact Assessment: Evaluates systemic liver stress caused by alcohol consumption, obesity, or metabolic syndromes.

Key LFT Test Components Analyzed

• Liver Enzymes (ALT & AST): Measures Alanine Transaminase and Aspartate Transaminase; high levels signal active liver cell damage or injury.

• Bilirubin Levels: Measures the metabolic waste product cleared by the liver; elevated levels cause jaundice and indicate bile duct or filtration issues.

• Alkaline Phosphatase (ALP): Evaluates an enzyme related to bile ducts; elevated levels suggest bile duct blockages or gallbladder issues.

• Proteins (Albumin & Total Protein): Assesses how well the liver produces essential proteins required for fluid balance and blood clotting.

LFT Test Preparation & Considerations

• Fasting Requirements: Fasting for 10 to 12 hours before the test is often necessary to ensure accurate liver enzyme readings.

• Alcohol & Supplement Disclosure: Inform your physician about recent alcohol intake and dietary supplements, as these can temporarily skew enzyme levels.

• Comprehensive Diagnostic Follow-Up: Abnormal LFT results often warrant further diagnostic imaging, such as an abdominal ultrasound or CT scan, to confirm a diagnosis.