Urinary Malic Acid (Malate)
Final four-carbon intermediate of the TCA cycle oxidized to oxaloacetate by mitochondrial malate dehydrogenase (MDH2).
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.
0.5 - 4.0 ug/mg Cr
General reference distribution across unselected commercial populations.
1.0 - 3.0 ug/mg Cr
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Participates in the malate-aspartate shuttle to transfer cytosolic NADH reducing equivalents across the inner mitochondrial membrane.
Differential Diagnosis
Elevated Levels (Malate High)
- •Niacin (NAD+) deficiency or high cytosolic NADH/NAD+ ratio
- •MDH block
Low Levels (Malate Low)
- •Normal mitochondrial shuttle mechanics
- •Optimal oxaloacetate regeneration
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 Malate
- Targeted organ system imaging or functional dynamic testing related to malate-aspartate shuttle & gluconeogenesis
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Urinary Malic Acid - The New England Journal of Medicine (2021). PMID: 34190124
- [2]Malate 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 Malic Acid (Malate) into overall healthspan optimization.