Anti-LGI1 & CASPR2 Antibodies (VGKC Complex)
Autoantibodies directed against proteins complexed with Kv1 voltage-gated potassium channels: Leucine-rich glioma-inactivated 1 (LGI1) and Contactin-associated protein-like 2 (CASPR2).
Standard vs. Optimal Reference Rangesnmol/L
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.
<0.02 nmol/L (negative)
General reference distribution across unselected commercial populations.
<0.02 nmol/L
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
LGI1 antibodies disrupt synaptic AMPA receptor scaffolding; CASPR2 antibodies impair axonal potassium channel clustering at the juxtaparanode.
Differential Diagnosis
Elevated Levels (VGKC Complex High)
- •LGI1 Autoimmune Limbic Encephalitis (faciobrachial dystonic seizures, hyponatremia)
- •CASPR2 Neuromyotonia / Morvan Syndrome / Peripheral Nerve Hyperexcitability
Low Levels (VGKC Complex Low)
- •Non-autoimmune epilepsy
- •Quiescent neurological baseline
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 VGKC Complex
- Targeted organ system imaging or functional dynamic testing related to limbic encephalitis & morvan syndrome
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Anti-LGI1 & CASPR2 Antibodies - The New England Journal of Medicine (2021). PMID: 34090124
- [2]VGKC Complex 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 Anti-LGI1 & CASPR2 Antibodies (VGKC Complex) into overall healthspan optimization.