Urinary Kidney Injury Molecule-1 (KIM-1)
Type 1 transmembrane glycoprotein with an immunoglobulin and mucin domain, expressed at negligible levels in normal kidney tissue.
Standard vs. Optimal Reference Rangesng/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.
<1.0 ng/mL (urine)
General reference distribution across unselected commercial populations.
<0.5 ng/mL
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
Upregulated massively on the apical membrane of dedifferentiated proximal tubular cells following ischemic or toxic insult, shedding its ectodomain into urine.
Differential Diagnosis
Elevated Levels (KIM-1 High)
- •Proximal tubular acute injury and necrosis
- •Drug-induced nephrotoxicity
- •Clear cell renal cell carcinoma (shed from tumor cells)
Low Levels (KIM-1 Low)
- •Healthy proximal tubular brush border
- •Absence of acute tubular stress
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 KIM-1
- Targeted organ system imaging or functional dynamic testing related to proximal tubular dedifferentiation
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Urinary Kidney Injury Molecule-1 - The New England Journal of Medicine (2021). PMID: 34090124
- [2]KIM-1 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 Urinary Kidney Injury Molecule-1 (KIM-1) into overall healthspan optimization.