1. ISO 15189:2003: Medical Laboratories—Particular Requirements for Quality and Competence http://www.iso.org/iso/standards_development/technical_committees/list_of_iso_technical_committees.htm .
2. OECD 2007: OECD Guidelines for Quality Assurance in Molecular Genetic Testing, www.oecd.org/sti/biotechnology/ (also applicable to cytogenetic laboratories).
3. Howell R, Hastings RJ : The current scope of cytogenetics external quality assessment schemes and key recommendations for harmonization of external quality assessment in Europe, 2006, www.eurogentest.org .
4. Hastings RJ, Cavani S, Dagna Bricarelli F, Patsalis PC, Kristoffersson U : Cytogenetic Guidelines and Quality Assurance: A common European framework for quality assessment for constitutional and acquired cytogenetic investigations. ECA Newsl 2006, www.biologia.uniba.it/eca and www.eurogentest.org .
5. ISCN 2005: An International System for Human Cytogenetic Nomenclature, Shaffer LG, Tommerup N (eds). S Karger: Basel, 2005.