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Related Experiment Videos

Quantitative flow cytometry: inter-laboratory variation

V E Zenger1, R Vogt, F Mandy

  • 1Division of Cellular and Gene Therapies, Office of Therapeutic Research and Review, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Bethesda, Maryland 20892, USA.

Cytometry
|October 17, 1998
PubMed
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Quantitative flow cytometry (QFCM) standardizes instrument performance. However, variations between donors and labs persist, likely due to non-unified protocols rather than instrumentation issues.

Area of Science:

  • Immunology
  • Biotechnology
  • Analytical Chemistry

Background:

  • Flow cytometry requires standardization for reliable results.
  • Quantitative flow cytometry (QFCM) aims to standardize measurements within and between instruments.

Purpose of the Study:

  • To assess the effectiveness of QFCM in standardizing antibody-binding capacity (ABC) measurements for CD4, CD8, and CD3 cells.
  • To identify sources of variation in QFCM measurements across different instruments and laboratories.

Main Methods:

  • Utilized FACScan flow cytometers, QC3 beads, blank beads, and microbead standards (MESF, QSC) for instrument setup and calibration.
  • Determined ABC for CD4, CD8, and CD3 cells from normal donors.
  • Analyzed single-parameter fluorescent histograms to calculate instrument parameters and ABCs.

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Main Results:

  • Demonstrated consistent instrument performance across laboratories.
  • Observed significant variations in CD3, CD4, and CD8 ABCs between donors and laboratories despite standardization.
  • Instrument performance was consistent, suggesting non-instrumental factors contribute to variability.

Conclusions:

  • While QFCM ensures consistent instrument operation, standardization of cell surface marker quantification remains challenging.
  • Variations may stem from non-unified protocols, including antibody saturation, lysis/fixation methods, and microbead behavior.
  • Further development of unified protocols is necessary for robust QFCM standardization.