Introduction:

Nursing, as a profession, has developed an improvement at the level of health systems, especially in the healthcare area. The needs demanded by society have been responded with the evolution of the role, as well as an increase of functions and responsibilities in the profession, which has led to the emergence of a new reference: the advanced practice nurse.

Objective:

To validate the instrument for defining the role of advanced practice nurse at the tertiary level of healthcare in Cuba.

Methods:

A methodological study was carried out in Complejo Científico Ortopédico Internacional “Frank País”, in Havana, and in the Cardiocentro of Villa Clara Province, Cuba, in the year 2022, through piloting with 15 nurses of the orthopedics and traumatology service and 15 nurses working at the Cardiocentro of Villa Clara. An index was calculated with the application of Crespo's fuzzy logic, while Cronbach's alpha was used for determining the internal consistency of the instrument.

Results:

With the application of Crespo's fuzzy logic, correlation between items, internal consistency and factor analysis were observed. The reliability of the test showed a Cronbach's alpha coefficient of 0.95 and also a standardized Cronbach's alpha of 0.95, results that enhance the high internal consistency of the applied scale.

Conclusions:

The role-defining instrument for advanced practice nurse is considered validated for the nursing staff of the tertiary level of healthcare in Cuba, by obtaining high reliability, through piloting with adequate validity and reliability indexes.

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