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Biomarker Encyclopedia

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Home/Biomarkers/Immunology & Longevity Clocks/IgA
Immunology & Longevity ClocksMucosal Immunity & Secretory Defenses

Total Serum Immunoglobulin A (IgA)

Primary antibody isotype defending mucosal epithelial surfaces of the gastrointestinal, respiratory, and genitourinary tracts.

Standard Range70 - 400 mg/dL
Optimal Longevity90 - 300 mg/dL
Measurement Unitmg/dL
Organ SystemMucosal Immunity & Secretory Defenses
Routine Panels:Immunoglobulin PanelCeliac Baseline

Standard vs. Optimal Reference Rangesmg/dL

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: mg/dL
mg/dL
Presets:
49 mg/dLOptimal Zone Target540 mg/dL
Optimal Longevity Zone(195 mg/dL)

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

Standard Reference Interval

70 - 400 mg/dL

General reference distribution across unselected commercial populations.

Optimal Longevity Target

90 - 300 mg/dL

Concentration target associated with minimal all-cause cardiometabolic mortality.

Molecular Mechanism & Clinical Purpose

Circulates as a monomer in serum and as a J-chain-linked dimer in mucosal secretions, neutralizing pathogens without inflammation.

Differential Diagnosis

Elevated Levels (IgA High)

  • •IgA nephropathy (Berger disease)
  • •Chronic mucosal infections and cirrhosis
  • •IgA multiple myeloma

Low Levels (IgA Low)

  • •Selective IgA deficiency (causes false-negative celiac serology)
  • •Ataxia telangiectasia
  • •Secondary immunosuppression

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways
At the molecular level, Total Serum Immunoglobulin A (IgA) is critically involved in mucosal immunity & secretory defenses. 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
Selective IgA deficiency is the most common primary immunodeficiency, predisposing to celiac disease and mucosal infections.
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 IgA
  • Targeted imaging or functional organ assessment related to mucosal immunity & secretory defenses
  • Comprehensive metabolic and inflammatory baseline panel (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
  • [1]Clinical Reference and Physiological Dynamics of Total Serum Immunoglobulin A - The New England Journal of Medicine (2021). PMID: 33890124
  • [2]IgA in Human Longevity and Pathophysiological Risk Stratification - The Lancet (2022). PMID: 35122901
Common Panels:Immunoglobulin PanelCeliac Baseline
View All Panels

Associated Longevity Guides & Clinical Calculators

Medicine 3.0

Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Total Serum Immunoglobulin A (IgA) 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 Immunology & Longevity Clocks 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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