Urinary Pyroglutamic Acid (5-Oxoproline) (5-Oxoproline)
Cyclic lactam of glutamic acid intermediate formed in the gamma-glutamyl cycle during glutathione synthesis and degradation.
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.
<50 ug/mg Cr
General reference distribution across unselected commercial populations.
<25 ug/mg Cr
Concentration target associated with minimal all-cause cardiometabolic mortality.
Molecular Mechanism & Clinical Purpose
When intracellular glutathione is severely depleted, feedback inhibition on gamma-glutamylcysteine synthetase is lost, overproducing 5-oxoproline.
Differential Diagnosis
Elevated Levels (5-Oxoproline High)
- •Severe intracellular glutathione depletion (chronic acetaminophen use, critical illness, sepsis)
- •Glutathione synthetase deficiency (inborn error)
- •Severe glycine/cysteine deficiency
Low Levels (5-Oxoproline Low)
- •Optimal intracellular glutathione stores
- •Intact gamma-glutamyl cycle
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 5-Oxoproline
- Targeted organ system imaging or functional dynamic testing related to glutathione depletion & ggt shunt
- Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
- [1]Clinical Reference and Molecular Physiology of Urinary Pyroglutamic Acid (5-Oxoproline) - The New England Journal of Medicine (2021). PMID: 34190124
- [2]5-Oxoproline 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 Pyroglutamic Acid (5-Oxoproline) (5-Oxoproline) into overall healthspan optimization.