How do liver function tests help in diagnosing liver disorders
Liver function tests (LFTs) help diagnose liver disorders by measuring various enzymes, proteins, and substances in the blood that indicate liver health and function. These tests help detect liver inflammation, damage, infection, or disease.
Key Components of Liver Function Tests & Their Significance:
- Alanine Aminotransferase (ALT): Elevated in liver damage, hepatitis, or fatty liver disease.
- Aspartate Aminotransferase (AST): Indicates liver or muscle damage, often used with ALT for diagnosis.
- Alkaline Phosphatase (ALP): High levels suggest bile duct obstruction or liver/bone disease.
- Bilirubin: High levels indicate jaundice, liver dysfunction, or bile duct blockage.
- Albumin: Low levels suggest chronic liver disease or malnutrition.
- Total Protein: Measures albumin and globulin, which can indicate liver or kidney disease.
- Gamma-Glutamyl Transferase (GGT): Elevated in liver or bile duct disease, often linked to alcohol-related liver damage.
- Prothrombin Time (PT)/INR: Prolonged PT suggests impaired liver function affecting blood clotting.
How LFTs Help in Diagnosis:
- Detect Liver Damage Early: Identify issues before symptoms appear.
- Differentiate Between Liver Conditions: Helps distinguish between hepatitis, cirrhosis, or bile duct diseases.
- Monitor Disease Progression: Tracks worsening or improvement in chronic liver diseases.
- Assess Treatment Effectiveness: Evaluates response to medications or lifestyle changes.
Abnormal results often require further tests like imaging (ultrasound, CT, MRI) or liver biopsy for a definitive diagnosis.
