Quality control study of the italian group of cytometry on flow cytometry cellular DNA content measurements

Authors

  • D. Tirindelli Danesi,

    Corresponding author
    1. Italian Group of Cytometry (GIC), Department of Biological and Health Effects, ENEA CRE Casaccia, 301-00060 Rome, Italy
    • Diagnostic and Therapeutic Applications Unit, ENEA CRE Casaccia, Via Anguillarese 301-00060 Rome A.D. Italy
    Search for more papers by this author
  • M. Spanòg,

    1. Italian Group of Cytometry (GIC), Department of Biological and Health Effects, ENEA CRE Casaccia, 301-00060 Rome, Italy
    Search for more papers by this author
  • P. Altavista

    1. Italian Group of Cytometry (GIC), Department of Biological and Health Effects, ENEA CRE Casaccia, 301-00060 Rome, Italy
    Search for more papers by this author

  • See page 583 for a complete list of the Italian Group of Cytometry (GIC) Cytometry DNA Ploidy Quality Control and Standardization Committee.

Abstract

A quality control study on DNA flow cytometry, extended to 43 national laboratories, has been carried out by the Italian Group of Cytometry, using defined fixed suspensions of cultured human leukemia K562 cells and human blood lymphocytes. The participating laboratories were allowed to follow their own staining and measurement protocols. Aliquots of cellular suspension had to be measured three times on the same day and two other times on different days. A large heterogeneity of procedures emerged among participants. The average of mean DNA index laboratory values, from 36 laboratories who sent evaluable data, was 1.68, with a range from 1.49 to 1.97. The coefficients of variation ranged from 2.35 to 9.39% and from 2.79 to 8.5% for diploid and aneuploid peaks, respectively. Statistical analysis of the results showed quite good intralaboratory reproducibility, but statistically significant differences were observed among laboratories, for both DNA indices and coefficients of variation. These differences appear to be consistent. For standardization, it is essential that efforts should be made to identify the main sources of variation and to control them. © 1993 Wiley-Liss, Inc.

Ancillary