Frutuoso, JoséSilva, Regina2022-02-182022-02-182015-11Frutuoso, J. A., & Silva, R. A. (2015). A model of external quality control. In R. A. Silva, P. Baylina, F. Q. Vieira, C. Barrias, M. Rubim, T. Coelho, C. Prudêncio, & Â. Jesus (Eds.), II Congresso Internacional da Saúde Gaia Porto: Livro de Resumos (pp. 27 - 28). Escola Superior de Tecnologia da Saúde do Instituto Politécnico do Porto.978-989-20-6340-9http://hdl.handle.net/10400.22/20007The evaluation of histochemical techniques is qualitative and requires the use of positive controls, specific to each method. As this evaluation can be subjective, there is a great need for laboratories to participate, systematically, in external quality control schemes in histochemistry. In Portugal there is no such systematic control.engconference object