Urinary Methylsuccinic Acid (Methylsuccinate)
Branched dicarboxylic acid formed via alternative carboxylation of isobutyryl-CoA or isovaleryl-CoA during branched-chain amino acid overload.
Standard vs. Optimal Reference Rangesug/mg Cr
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.
<2.0 ug/mg Cr
General reference distribution across unselected commercial populations.
<0.8 ug/mg Cr
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Accumulates when isovaleryl-CoA dehydrogenase (IVD) or isobutyryl-CoA dehydrogenase (IBD) enzymatic capacity is saturated or deficient.
Differential Diagnosis
Elevated Levels (Methylsuccinate High)
- •Isovaleric Acidemia (IVD deficiency)
- •Multiple acyl-CoA dehydrogenase defects
- •BCAA catabolic saturation
Low Levels (Methylsuccinate Low)
- •Normal branched-chain fatty acid mitochondrial clearance
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 Methylsuccinate
- Targeted organ system imaging or functional dynamic testing related to isovaleryl-coa dehydrogenase alternative flux
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Urinary Methylsuccinic Acid - The New England Journal of Medicine (2021). PMID: 34190124
- [2]Methylsuccinate Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35422901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Urinary Methylsuccinic Acid (Methylsuccinate) into overall healthspan optimization.