Objectives: to build and validate a data collection instrument for onco-hematological patients undergoing outpatient chemotherapy. Methods: methodological study that aimed to build a scientifically consistent data collection instrument to evaluate hematological patients. There were five stages: identification of empirical indicators, evaluation of empirical indicators by focus group, construction of the instrument, content validation by judges and clinical validation. Built based on the Theory

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... f Basic Human Needs of Horta, adjusted by Garcias and Cubas. Results: the built instrument contains data on patient identification, perception and expectations related to the disease, assessment of psychobiological, psychosocial and psychospiritual needs. It reached 95% CVI, ensuring the instrument's content validity and Cronbach's alpha test with a reliability of 0.93. Conclusions: the instrument is a valid technology to assist nurses in data collection and may serve as a tool for onco-hematological nursing care, teaching and research.