Serum Total & Free Carnitine (Carnitine)
Quaternary amine essential for translocating long-chain fatty acids across the inner mitochondrial membrane via CPT-1/CPT-2.
Standard vs. Optimal Reference Rangesumol/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.
40 - 80 umol/L (Total), 30 - 60 umol/L (Free)
General reference distribution across unselected commercial populations.
45 - 70 umol/L (Total)
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Transfers fatty acyl groups into mitochondria via the carnitine palmitoyltransferase shuttle for beta-oxidation.
Differential Diagnosis
Elevated Levels (Carnitine High)
- •Primary systemic carnitine deficiency (OCTN2 mutation)
- •Valproic acid or pivalate antibiotic therapy
- •Dialysis loss
Low Levels (Carnitine Low)
- •Adequate dietary intake (meat, fish)
- •Intact endogenous hepatic/renal synthesis
Technical Reference & Deep Dive
Biochemistry & Enzymatic Pathways
Longevity Risk Architecture & Epidemiology
Pre-Analytical Caveats & Diagnostic Workup
Pre-Analytical Considerations:
Collect in standard collection tubes as specified by the laboratory protocol. Avoid hemolysis and process serum/plasma promptly within 2 hours. Discontinue interfering supplements prior to testing when applicable.
Reflexive Testing Protocol:
- Confirmatory testing and secondary biomarker panel evaluation for Carnitine
- Targeted imaging or functional organ assessment related to mitochondrial beta-oxidation
- Comprehensive metabolic and inflammatory baseline panel (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Physiological Dynamics of Serum Total & Free Carnitine - The New England Journal of Medicine (2021). PMID: 33890124
- [2]Carnitine in Human Longevity and Pathophysiological Risk Stratification - The Lancet (2022). PMID: 35122901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Serum Total & Free Carnitine (Carnitine) into overall healthspan optimization.