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Biomarker Encyclopedia

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Home/Biomarkers/Micronutrients & Vitamins/RBC Folate
Micronutrients & VitaminsLong-Term Tissue Folate Reserve

Red Blood Cell Folate (RBC Folate)

Intracellular concentration of polyglutamated folate within erythrocytes, reflecting 3-month tissue folate stores.

Standard Range280 - 790 ng/mL
Optimal Longevity>400 ng/mL
Measurement Unitng/mL
Organ SystemLong-Term Tissue Folate Reserve
Routine Panels:Long-Term Vitamin Status

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.

Interactive Range Analyzer
Unit: ng/mL
ng/mL
Presets:
196 ng/mLOptimal Zone Target1080 ng/mL
Optimal Longevity Zone(600 ng/mL)

Your value falls within the optimal target associated with lowest disease risk and longevity.

Standard Reference Interval

280 - 790 ng/mL

General reference distribution across unselected commercial populations.

Optimal Longevity Target

>400 ng/mL

Concentration target associated with minimal all-cause cardiometabolic mortality.

Molecular Mechanism & Clinical Purpose

Erythrocytes incorporate folate only during erythropoiesis, making RBC folate independent of recent transient dietary meals.

Differential Diagnosis

Elevated Levels (RBC Folate High)

  • •High-dose folic acid/methylfolate supplementation

Low Levels (RBC Folate Low)

  • •Chronic dietary folate deficiency
  • •MTHFR genetic polymorphisms
  • •Malabsorption syndromes
  • •Megaloblastic anemia

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways
At the molecular level, Red Blood Cell Folate (RBC Folate) is critically involved in long-term tissue folate reserve. Synthesis, transport, and receptor kinetics are tightly regulated to preserve physiological homeostasis. Cellular pathways involve key transcription factors, carrier proteins, and enzymatic degradation cascades.
Longevity Risk Architecture & Epidemiology
Gold standard biomarker for chronic tissue folate status, neural tube defect prevention, and genomic DNA methylation.
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 RBC Folate
  • Targeted imaging or functional organ assessment related to long-term tissue folate reserve
  • Comprehensive metabolic and inflammatory baseline panel (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
  • [1]Clinical Reference and Physiological Dynamics of Red Blood Cell Folate - The New England Journal of Medicine (2021). PMID: 33890124
  • [2]RBC Folate in Human Longevity and Pathophysiological Risk Stratification - The Lancet (2022). PMID: 35122901
Common Panels:Long-Term Vitamin Status
View All Panels

Associated Longevity Guides & Clinical Calculators

Medicine 3.0

Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Red Blood Cell Folate (RBC Folate) into overall healthspan optimization.

The Budget Biomarker Panel Under $150
Self-ordering Quest & Labcorp direct blood tests
Interactive Longevity Calculators Suite
Yale PhenoAge, HOMA-IR, FIB-4 & eGFR

Related Micronutrients & Vitamins Biomarkers

High-Sensitivity C-Reactive Protein
hs-CRP · < 0.5 mg/L
Serum Creatinine
Cr · 0.8 - 1.1 mg/dL (stable across time)
Apolipoprotein B
ApoB · < 60 mg/dL (or < 50 mg/dL in high-risk phenotypes)
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