Soluble Alpha-Klotho (s-Klotho)
Circulating anti-aging protein shed from renal tubular membrane Klotho by ADAM10/17 metalloproteinases, serving as co-receptor for FGF-23.
Standard vs. Optimal Reference Rangespg/mL
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.
400 - 1600 pg/mL
General reference distribution across unselected commercial populations.
>900 pg/mL
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Inhibits Wnt, IGF-1, and TGF-beta signaling cascades, suppresses vascular calcification, and upregulates endogenous antioxidant defenses.
Differential Diagnosis
Elevated Levels (s-Klotho High)
- •High circulating anti-aging protection (>1000 pg/mL)
- •Optimal renal parenchymal health
Low Levels (s-Klotho Low)
- •Chronic kidney disease (early progressive loss of Klotho expression)
- •Accelerated vascular medial calcification
- •Premature biological aging phenotype
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 s-Klotho
- Targeted organ system imaging or functional dynamic testing related to anti-aging & cardiorenal protection
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Soluble Alpha-Klotho - The New England Journal of Medicine (2021). PMID: 33990124
- [2]s-Klotho Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35222901
Associated Longevity Guides & Clinical Calculators
Medicine 3.0Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Soluble Alpha-Klotho (s-Klotho) into overall healthspan optimization.