LFTs (Liver Function Tests)

What are Liver Function Tests (LFTs)?

Liver Function Tests (LFTs) comprise a panel of blood biomarkers that assess the health, function, and integrity of the liver—the body’s largest internal organ responsible for metabolism, detoxification, protein synthesis, and bile production. The standard LFT panel in Pakistan typically includes ALT, AST, ALP, bilirubin (total and direct), albumin, total protein, and sometimes GGT. These tests help diagnose liver diseases, monitor chronic conditions like hepatitis, and evaluate medication side effects, making them essential in Pakistan where viral hepatitis (B and C) affects millions.

Clinical Procedure: What to Expect

• Fasting Requirement: Most labs recommend 8-12 hours fasting for accurate bilirubin and protein measurements, though some parameters can be tested non-fasting
• Venous Blood Draw: A phlebotomist collects approximately 5-7 ml of blood from your arm vein using standard aseptic techniques
• Panel Analysis: The sample undergoes automated biochemical analysis measuring multiple liver enzymes and proteins simultaneously, with results typically reported together

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When are Liver Function Tests Performed? (Clinical Indications)

Pakistani physicians order LFTs across numerous clinical scenarios:

• Hepatitis Screening and Monitoring: Essential for diagnosing and tracking viral hepatitis B and C (endemic in Pakistan), evaluating treatment response to antivirals, and assessing liver damage progression
• Medication Toxicity Surveillance: Regular monitoring for patients on hepatotoxic drugs including TB medications (rifampicin, isoniazid, pyrazinamide), statins, methotrexate, and anti-epileptics
• Jaundice Investigation: First-line diagnostic tool when patients present with yellowing skin/eyes, dark urine, or pale stools to differentiate hepatic, pre-hepatic, and post-hepatic causes
• Chronic Liver Disease Assessment: Evaluates cirrhosis, fatty liver disease (increasingly common with rising obesity rates in Pakistan), and alcoholic liver disease severity and complications
• Pre-operative Evaluation: Routine screening before surgery to ensure adequate liver synthetic function for anesthesia metabolism and post-operative healing
• Unexplained Symptoms: Investigates fatigue, abdominal pain, ascites, unexplained weight loss, or abnormal bleeding that may indicate liver pathology

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What Do Liver Function Tests Detect?

This comprehensive panel reveals multiple aspects of hepatobiliary health:

• Hepatocellular Injury: Elevated ALT and AST indicate liver cell damage from hepatitis, medications, alcohol, or fatty liver disease
• Cholestasis (Bile Flow Obstruction): Raised ALP and GGT with elevated bilirubin suggest bile duct blockage from gallstones, tumors, or primary biliary conditions
• Synthetic Function: Low albumin and prolonged PT/INR indicate impaired liver protein production, suggesting advanced liver disease or cirrhosis
• Hemolysis or Bilirubin Metabolism Disorders: Elevated indirect bilirubin may indicate Gilbert’s syndrome, hemolytic anemia, or neonatal jaundice
• Infiltrative Liver Disease: Abnormal patterns may suggest fatty liver, granulomatous disease (TB), amyloidosis, or metastatic cancer
• Acute Liver Failure: Dramatically elevated transaminases (>1000 U/L) with coagulopathy indicate fulminant hepatic necrosis requiring urgent intervention

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When Will I Receive My Test Results?

LFT results are typically available within 12-24 hours at major Pakistani laboratories. Chughtai Lab and IDC offer same-day reporting for samples collected before noon. Premium facilities like Aga Khan University Hospital provide results within 6-8 hours for urgent cases. Digital delivery includes:

• SMS Alerts: Notification when reports are ready for download
• WhatsApp Integration: Direct PDF reports sent securely
• Lab Portals: Online access via Chughtai Online, IDC e-Reports, and Excel Labs websites
• ZUNF Medicare Dashboard: Centralized report management with interpretation support

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Liver Function Tests Reference Ranges / Interpretation Index

Test Parameter	Normal Range (Adult)	Unit	Clinical Significance When Elevated
ALT (SGPT)	7-56 U/L	Units/Liter	Hepatocellular injury (hepatitis, fatty liver)
AST (SGOT)	10-40 U/L	Units/Liter	Liver damage, also elevated in cardiac/muscle disease
ALP	44-147 U/L	Units/Liter	Cholestasis, bone disease, pregnancy
Bilirubin (Total)	0.1-1.2 mg/dL	mg/dL	Jaundice, hemolysis, liver dysfunction
Bilirubin (Direct)	0.0-0.3 mg/dL	mg/dL	Cholestasis, bile duct obstruction
Albumin	3.5-5.5 g/dL	g/dL	Low: chronic liver disease, malnutrition
Total Protein	6.3-8.2 g/dL	g/dL	Liver function, nutritional status
GGT	8-61 U/L (males) 5-36 U/L (females)	Units/Liter	Alcohol use, cholestasis, biliary disease

Reference ranges may vary slightly between laboratories; always consult your lab-specific normal values

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Key Benefits of Liver Function Tests

• Early Disease Detection: Identifies liver dysfunction before symptoms appear, enabling early intervention for conditions like hepatitis C (which can remain asymptomatic for decades)
• Comprehensive Organ Assessment: Single panel evaluates multiple aspects—cellular injury, bile production, synthetic capacity, and detoxification—providing complete liver health picture
• Treatment Monitoring: Essential for tracking antiviral therapy response in hepatitis patients and detecting medication side effects before serious liver damage occurs
• Cost-Effective Screening: Relatively inexpensive panel (PKR 1,500-3,000) that screens for multiple conditions simultaneously, making it economically accessible in Pakistan
• Risk Stratification: Abnormal LFTs prompt further targeted investigation with imaging (ultrasound, CT) or specialized tests (viral markers, autoimmune panels, FibroScan)

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