Helminthic diseases are a major public health problem. Laboratory diagnosis is of vital importance, which must be supported by a quality assurance system. The objective of the study was to carry out an external evaluation of the laboratories that make up the health care network in order to compare the results of the external quality control in the diagnosis of helminths of the governing laboratory, the Provincial Center of Hygiene, Epidemiology and Microbiology, with the participants in Villa Clara province, Cuba. A descriptive and transversal study was carried out, with a discretional sampling of intentional type by criteria. A total of 2,857 stool samples from 36 laboratories were processed from March 2016 to March 2019 by the Willis - Molloyʹs high-density solution method. In 98.6% of the diagnoses there was concordance of results and no concordance in 1% (29), in addition to 7 (0.2%...