Liver-Kidney Microsome (LKM)-1 Antibody (ELISA)
- Sample Type
- Serum
- Fasting
- No
- Unit
- U/mL
Function
The Liver-Kidney Microsome Type 1 (LKM-1) antibody test is a specialized immunological assay used primarily to identify the presence of autoantibodies directed against the enzyme cytochrome P450 2D6. In a healthy immune system, antibodies protect the body from external pathogens. However, in autoimmune conditions, the body loses self-tolerance and begins attacking its own cellular components. The LKM-1 antibody specifically targets proteins within the hepatocytes (liver cells) and renal proximal tubular cells (kidney cells).
Why it is Ordered
This test is crucial when a physician suspects Autoimmune Hepatitis (AIH), specifically Type 2. AIH is a chronic condition where the immune system attacks the liver, leading to inflammation and potential scarring (cirrhosis). While Type 1 AIH is more common in adults and associated with ANA (Antinuclear Antibodies), Type 2 AIH is more frequently seen in children and adolescents. Doctors order this test when a patient presents with unexplained jaundice, fatigue, abdominal pain, or elevated liver enzymes (ALT/AST) that do not respond to standard viral hepatitis treatments.
Associated Conditions
- Autoimmune Hepatitis Type 2: This is the primary condition associated with LKM-1. It is often more aggressive than Type 1 and requires long-term immunosuppression.
- Chronic Hepatitis C: A subset of patients with Hepatitis C virus (HCV) may develop LKM-1 antibodies, though usually at lower titers than those seen in AIH.
- Drug-Induced Liver Injury: Certain medications can trigger an immune response that mimics the appearance of LKM-1 antibodies.
- AIRE Deficiency: Part of the Autoimmune Polyendocrinopathy-Candidiasis-Ectodermal Dystrophy (APECED) syndrome.
Check Your Result
Check Your Result
Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
A second opinion is often vital because LKM-1 antibodies can sometimes be transiently present in patients with Hepatitis C or drug-induced liver toxicity, leading to a potential misdiagnosis of lifelong autoimmune hepatitis. Furthermore, the ELISA method can occasionally yield low-level false positives. It is essential to correlate these results with a liver biopsy and other markers like ASMA or ANA to ensure a correct diagnosis before commencing high-dose steroid therapy.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Liver-Kidney Microsome (LKM)-1 Antibody (ELISA):
Official Sources
- Anti-LKM-1 - Testing.comTesting.com
Research & Guidelines
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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