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Related Experiment Video

Updated: Oct 28, 2025

Detection and Quantification of Calcitonin Gene-Related Peptide CGRP in Human Plasma Using a Modified Enzyme-Linked Immunosorbent Assay
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Detection and Quantification of Calcitonin Gene-Related Peptide CGRP in Human Plasma Using a Modified Enzyme-Linked Immunosorbent Assay

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CGRP measurements in human plasma - a methodological study.

Karl Messlinger1, Birgit Vogler1, Annette Kuhn1

  • 1Institute of Physiology and Pathophysiology, Friedrich-Alexander-University Erlangen-Nürnberg, Germany.

Cephalalgia : an International Journal of Headache
|July 16, 2021
PubMed
Summary
This summary is machine-generated.

Calcitonin gene-related peptide (CGRP) plasma levels are reliably measured using optimized enzyme-linked immunosorbent assays. Individual CGRP levels vary significantly, but remain stable under hypoxia, supporting their use in longitudinal headache studies.

Keywords:
Calcitonin gene-related peptideblood plasmaenzyme-linked immunosorbent assaynormobaric hypoxia

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Clinical Chemistry

Background:

  • Calcitonin gene-related peptide (CGRP) is a biomarker for primary headaches.
  • Inconsistent published data on CGRP levels is due to non-standardized methodologies.
  • Precise description of methods is lacking in most CGRP biomarker studies.

Purpose of the Study:

  • To establish a reliable method for measuring CGRP plasma levels.
  • To investigate the stability and variability of CGRP in human plasma.
  • To assess CGRP levels in healthy individuals and under hypoxic conditions.

Main Methods:

  • Enzyme-linked immunosorbent assay (ELISA) was employed for CGRP quantification.
  • Optimized plasma preparation, protein purification, and standard solution preparation were performed.
  • CGRP-free plasma was utilized for creating accurate standard curves.

Main Results:

  • CGRP plasma levels are stable with peptidase inhibitors and after deep-freezing.
  • Standard solutions from synthetic intercellular fluid or pre-absorbed plasma yielded comprehensible results.
  • Healthy subjects exhibited wide-ranging CGRP plasma levels (<50 to >500 pg/mL), which remained stable during normobaric hypoxia exposure.

Conclusions:

  • Reliable CGRP measurements require buffering with peptidase inhibitors and immediate sample processing/freezing.
  • Significant individual variations in CGRP plasma levels exist without apparent pathology.
  • Plasma CGRP measurements are suitable for longitudinal studies, particularly in headache research.