LFT(Liver Function Tests)

What is Liver Function Test?

The liver is one of the most important organs in the human body, responsible for detoxification, metabolism, protein synthesis, and bile production. Liver Function Tests (LFTs) are a group of blood tests used to assess liver health, detect disease, monitor chronic conditions, and evaluate the effects of medications.

In Pakistan, where hepatitis B and hepatitis C remain major public health concerns, Liver Function Tests play a vital role in early diagnosis and disease management. Whether you are experiencing symptoms or undergoing routine health screening, understanding LFTs can help you make informed decisions about your liver health.

What Are Liver Function Tests (LFTs)?

Liver Function Tests (LFTs) are a panel of blood biomarkers that assess the health and function of the liver. These tests evaluate liver enzymes, proteins, and bilirubin levels to identify liver damage, bile duct problems, and the liver’s ability to produce essential proteins.

A standard LFT panel in Pakistan usually includes:

• Alanine Aminotransferase (ALT/SGPT)
• Aspartate Aminotransferase (AST/SGOT)
• Alkaline Phosphatase (ALP)
• Total Bilirubin
• Direct Bilirubin
• Albumin
• Total Protein
• Gamma-Glutamyl Transferase (GGT)

Together, these parameters provide a comprehensive picture of liver health.

Why Are Liver Function Tests Important?

Liver diseases often remain silent during their early stages. Many patients develop symptoms only after significant liver damage has occurred.

LFTs help:

• Detect liver disease early
• Diagnose hepatitis B and hepatitis C
• Monitor chronic liver conditions
• Assess medication-related liver toxicity
• Evaluate jaundice and bile duct disorders
• Measure liver synthetic function
• Support pre-operative health assessment

Early diagnosis improves treatment outcomes and prevents complications.

Clinical Procedure: What to Expect During an LFT Test

Liver Function Tests are simple blood tests that require only a few minutes to perform.

Fasting Requirements

Most laboratories recommend fasting for 8 to 12 hours before sample collection.

Fasting improves the accuracy of:

• Bilirubin measurements
• Albumin levels
• Total protein analysis

Water is generally allowed during fasting.

Blood Sample Collection

A trained phlebotomist collects approximately 5–7 mL of blood from a vein in the arm using sterile techniques.

The procedure is quick and usually causes minimal discomfort.

Laboratory Analysis

The blood sample is processed using automated biochemical analyzers.

Multiple parameters are measured simultaneously, and results are reported together in a single panel.

When Are Liver Function Tests Recommended?

Doctors order LFTs for various medical conditions and health assessments.

Hepatitis Screening and Monitoring

Pakistan has one of the highest burdens of hepatitis B and hepatitis C worldwide.

LFTs help:

• Diagnose viral hepatitis
• Monitor treatment response
• Evaluate disease progression
• Assess liver inflammation

Medication Toxicity Monitoring

Several medications can affect the liver.

Routine LFT monitoring is recommended for patients taking:

• Tuberculosis medications
• Statins
• Methotrexate
• Anti-epileptic drugs
• Long-term antibiotics

Early detection helps prevent serious liver injury.

Evaluation of Jaundice

Yellow discoloration of the skin and eyes may indicate liver disease.

LFTs help determine whether jaundice is caused by:

• Liver inflammation
• Hemolysis
• Bile duct obstruction

Assessment of Chronic Liver Disease

Doctors use LFTs to evaluate conditions such as:

• Liver cirrhosis
• Fatty liver disease
• Alcohol-related liver disease
• Chronic hepatitis

Regular monitoring helps assess disease severity.

Pre-Surgical Evaluation

LFTs are commonly ordered before surgery to ensure the liver can safely metabolize anesthesia and support post-operative recovery.

Investigation of Unexplained Symptoms

Liver Function Tests may be recommended for patients experiencing:

• Persistent fatigue
• Abdominal pain
• Weight loss
• Ascites
• Unexplained bleeding
• Weakness

What Do Liver Function Tests Detect?

LFTs provide information about several aspects of liver health.

Hepatocellular Injury

Elevated ALT and AST levels indicate liver cell damage.

Common causes include:

• Viral hepatitis
• Fatty liver disease
• Alcohol consumption
• Drug-induced liver injury

Cholestasis and Bile Duct Obstruction

Raised ALP, GGT, and bilirubin levels may suggest:

• Gallstones
• Bile duct blockage
• Primary biliary disease
• Liver tumors

Impaired Liver Synthetic Function

Low albumin and abnormal clotting profiles may indicate:

• Advanced liver disease
• Cirrhosis
• Malnutrition

Bilirubin Metabolism Disorders

Elevated bilirubin levels may occur in:

• Gilbert syndrome
• Hemolytic anemia
• Neonatal jaundice
• Liver dysfunction

Fatty Liver and Infiltrative Diseases

Abnormal LFT patterns can indicate:

• Non-alcoholic fatty liver disease (NAFLD)
• Tuberculosis-related liver involvement
• Amyloidosis
• Metastatic cancer

Acute Liver Failure

Very high liver enzyme levels may indicate severe liver injury requiring urgent medical care.

Understanding Liver Function Test Reference Ranges

ALT (SGPT)

Normal Range:

7–56 U/L

Elevated levels may indicate:

• Hepatitis
• Fatty liver disease
• Medication toxicity

AST (SGOT)

Normal Range:

10–40 U/L

Elevated levels may suggest:

• Liver injury
• Muscle disorders
• Cardiac disease

Alkaline Phosphatase (ALP)

Normal Range:

44–147 U/L

High values are associated with:

• Cholestasis
• Bone disorders
• Pregnancy

Total Bilirubin

Normal Range:

0.1–1.2 mg/dL

Elevated bilirubin causes:

• Jaundice
• Hemolysis
• Liver dysfunction

Direct Bilirubin

Normal Range:

0–0.3 mg/dL

High levels may indicate:

• Bile duct obstruction
• Cholestasis

Albumin

Normal Range:

3.5–5.5 g/dL

Low albumin levels may occur in:

• Cirrhosis
• Chronic liver disease
• Malnutrition

Total Protein

Normal Range:

6.3–8.2 g/dL

Abnormal values may reflect:

• Liver dysfunction
• Nutritional deficiencies

Gamma-Glutamyl Transferase (GGT)

Normal Range:

• Males: 8–61 U/L
• Females: 5–36 U/L

Elevated GGT levels are associated with:

• Alcohol-related liver disease
• Biliary obstruction
• Cholestasis

Benefits of Liver Function Tests

Early Disease Detection

LFTs can detect liver dysfunction before symptoms develop.

Early intervention improves outcomes, particularly in hepatitis C and fatty liver disease.

Comprehensive Liver Assessment

A single panel evaluates:

• Liver enzymes
• Bilirubin
• Protein synthesis
• Bile flow

This provides a complete picture of liver health.

Treatment Monitoring

Regular testing helps monitor:

• Hepatitis treatment
• Medication side effects
• Chronic liver disease progression

Cost-Effective Screening

LFT panels are relatively affordable in Pakistan and can identify multiple conditions simultaneously.

Risk Stratification

Abnormal LFT results may prompt additional investigations, including:

• Ultrasound
• FibroScan
• CT Scan
• Hepatitis markers
• Autoimmune liver tests

When Will I Receive My Results?

Most major laboratories in Pakistan provide LFT reports within 12–24 hours.

Some facilities offer same-day reporting.

Results are commonly delivered through:

SMS Notifications

Patients receive alerts when reports are ready.

WhatsApp Report Delivery

Secure PDF reports can be shared electronically.

Online Laboratory Portals

Many laboratories provide digital access to reports.

ZUNF Medicare Dashboard

Patients can manage reports and receive interpretation support through a centralized platform.

LFT Test Price in Pakistan

Liver Function Test prices vary among diagnostic centers.

Typical price ranges are:

• Chughtai Lab: PKR 2,000
• IDC: PKR 2,200–2,500
• Excel Labs: PKR 1,800
• Government Hospitals: PKR 500–1,000
• Aga Khan University Hospital: PKR 3,000–3,500

ZUNF Medicare helps patients access discounted laboratory packages and home sample collection services.