Antimitochondrial Antibodies (M2) (AMA-M2)
Autoantibodies targeting the E2 subunit of the pyruvate dehydrogenase complex (PDC-E2) located on the inner mitochondrial membrane.
Standard vs. Optimal Reference RangesUnits
Standard reference intervals represent the statistical 95% distribution of unselected commercial populations. Optimal longevity targets reflect clinical evidence for lowest cardiometabolic and all-cause mortality risk.
Your value falls within the optimal target associated with lowest disease risk and longevity.
<20.0 units (negative)
General reference distribution across unselected commercial populations.
<10.0 units
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Binds PDC-E2 aberrantly expressed on the apical surface of biliary epithelial cells, driving lymphocytic destruction of interlobular bile ducts.
Differential Diagnosis
Elevated Levels (AMA-M2 High)
- •Primary Biliary Cholangitis (PBC, intrahepatic bile duct destruction)
- •PBC-Autoimmune Hepatitis overlap syndrome
Low Levels (AMA-M2 Low)
- •Primary Sclerosing Cholangitis (PSC is typically AMA-negative)
- •Normal biliary homeostasis
Technical Reference & Deep Dive
Biochemistry & Enzymatic Pathways
Longevity Risk Architecture & Epidemiology
Pre-Analytical Caveats & Diagnostic Workup
Pre-Analytical Considerations:
Specimen collection should follow standardized phlebotomy protocols. Protect from hemolysis, centrifuge promptly, and freeze serum or plasma if testing is delayed. Patient should be in a resting, fasting state where indicated.
Reflexive Testing Protocol:
- Confirmatory testing and secondary biomarker quantification for AMA-M2
- Targeted organ system imaging or functional dynamic testing related to primary biliary cholangitis
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Antimitochondrial Antibodies (M2) - The New England Journal of Medicine (2021). PMID: 34090124
- [2]AMA-M2 Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35322901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Antimitochondrial Antibodies (M2) (AMA-M2) into overall healthspan optimization.