EQUAL-qual: A European program for external quality assessment of genomic DNA extraction and PCR amplification

Claudio Orlando, Paolo Verderio, Ronald Maatman, Jan Danneberg, Simon Ramsden, Michael Neumaier, Domenica Taruscio, Vincenzo Falbo, Robert Jansen, Claudia Casini-Raggi, Francesca Malentacchi, Ettore Marubini, Sara Pizzamiglio, Kris Vernelen, Jean Claude Libeer, Vladimir Palicka, Mario Pazzagli

Research output: Contribution to journalArticle


Background: Despite the rapid transition into routine clinical practice of molecular techniques based on PCR, external quality assessment (EQA) is still not widely available. The European Union and European Communities Confederation of Clinical Chemistry have supported the EQUAL project as a series of 3 different EQA programs for the assessment of molecular methods independently from analytes. We present the results from the EQUAL-qual program designed to evaluate the analytical aspects of DNA analysis by means of a conventional qualitative PCR experiment. Methods: The EQUAL-qual program provided DNA, blood samples, and primer sets to participant laboratories to assess DNA extraction and PCR amplification. We have developed statistical procedures to identify laboratories performing poorly in DNA extraction (quality and quantity), PCR efficiency, and data interpretation after electrophoresis. Results: An application to participate was obtained from 213 laboratories (from 25 countries), and 175 (82%) of laboratories submitted results for assessment. Questionable results in terms of quality and/or quantity of DNA derived from blood extractions were returned by 27% of laboratories (46 of 166). PCR efficiency showed high variability, with 3% of laboratories (5 of 163) showing a consistently low rate of amplification and 10% (18 of 175) not reporting the expected number of bands of the amplified targets. Conclusions: The results showed considerable variability in all phases of the experiment. The approach confirms the validity of EQA as a method for evaluating analytical aspects of PCR-based tests.

Original languageEnglish
Pages (from-to)1349-1357
Number of pages9
JournalClinical Chemistry
Issue number7
Publication statusPublished - Jul 2007

ASJC Scopus subject areas

  • Clinical Biochemistry

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    Orlando, C., Verderio, P., Maatman, R., Danneberg, J., Ramsden, S., Neumaier, M., Taruscio, D., Falbo, V., Jansen, R., Casini-Raggi, C., Malentacchi, F., Marubini, E., Pizzamiglio, S., Vernelen, K., Libeer, J. C., Palicka, V., & Pazzagli, M. (2007). EQUAL-qual: A European program for external quality assessment of genomic DNA extraction and PCR amplification. Clinical Chemistry, 53(7), 1349-1357. https://doi.org/10.1373/clinchem.2006.084004