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Biomarker Encyclopedia

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Home/Biomarkers/Endocrinology & Hormones/CgA
Endocrinology & HormonesNeuroendocrine Secretory Core Protein

Serum Chromogranin A (CgA)

49-kDa major acidic glycoprotein co-stored and co-released with peptide hormones and catecholamines from neuroendocrine secretory granules.

Standard Range<100.0 ng/mL
Optimal Longevity<50.0 ng/mL
Measurement Unitng/mL
Organ SystemNeuroendocrine Secretory Core Protein
Routine Panels:Neuroendocrine Tumor PanelCarcinoid Surveillance

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:
0 ng/mLOptimal Zone Target135 ng/mL
Optimal Longevity Zone(25 ng/mL)

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

Standard Reference Interval

<100.0 ng/mL

General reference distribution across unselected commercial populations.

Optimal Longevity Target

<50.0 ng/mL

Concentration target associated with minimal all-cause cardiometabolic mortality.

Molecular Mechanism & Clinical Purpose

Acts as the prohormone precursor for regulatory peptides (vasostatin, chromacin); serum levels correlate with total neuroendocrine tumor burden.

Differential Diagnosis

Elevated Levels (CgA High)

  • •Neuroendocrine tumors (carcinoid tumors, insulinomas, gastrinomas)
  • •Proton pump inhibitor (PPI) therapy (causes false-positive elevations)
  • •Severe renal insufficiency

Low Levels (CgA Low)

  • •Normal neuroendocrine quiescence
  • •Post-PPI discontinuation true baseline

Technical Reference & Deep Dive

Biochemistry & Enzymatic Pathways
At the molecular level, Serum Chromogranin A (CgA) plays an essential physiological role in neuroendocrine secretory core protein. Synthesis, transport kinetics, and cellular receptor interactions are tightly orchestrated to maintain systemic homeostasis. Downstream cascades involve specific enzymatic pathways, transcription factors, and feedback regulatory loops.
Longevity Risk Architecture & Epidemiology
Primary diagnostic and surveillance biomarker for gastroenteropancreatic neuroendocrine tumors (GEP-NETs) and pheochromocytomas.
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 CgA
  • Targeted organ system imaging or functional dynamic testing related to neuroendocrine secretory core protein
  • Comprehensive baseline metabolic, renal, and inflammatory assessment (CMP, CBC, hs-CRP)
Clinical Citations & Primary Literature (2)
  • [1]Clinical Reference and Molecular Physiology of Serum Chromogranin A - The New England Journal of Medicine (2021). PMID: 34090124
  • [2]CgA Dynamics in Human Longevity and Precision Medicine - The Lancet (2022). PMID: 35322901
Common Panels:Neuroendocrine Tumor PanelCarcinoid Surveillance
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Associated Longevity Guides & Clinical Calculators

Medicine 3.0

Explore comprehensive evidence-based clinical protocols, testing costs, and algorithmic calculators that incorporate Serum Chromogranin A (CgA) 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 Endocrinology & Hormones 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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