Objective:to elaborate an instrument for the measurement of the interpersonal relationship
in nursing care through the Item Response Theory, and the validation thereof. Method:methodological study, which followed the three poles of psychometry: theoretical,
empirical and analytical. The Nursing Care Interpersonal Relationship
Questionnaire was developed in light of the Imogene King’s Interpersonal
Conceptual Model and the psychometric properties were studied through the Item
Response Theory in a sample of 950 patients attended in Primary, Secondary and
Tertiary Health Care. Results:the final instrument consisted of 31 items, with Cronbach’s alpha of 0.90 and
McDonald’s Omega of 0.92. The parameters of the Item Response Theory demonstrated
high discrimination in 28 items, being developed a five-level interpretive scale.
At the first level, the communication process begins, gaining a wealth of
interaction. Subsequent levels demonstrate qualitatively the points of
effectiveness of the interpersonal relationship with the involvement of behaviors
related to the concepts of transaction and interaction, followed by the concept of
role. Conclusion:the instrument was created and proved to be consistent to measure interpersonal
relationship in nursing care, as it presented adequate reliability and validity
parameters.