The assessment of disability is a complex process that requires a detailed understanding of medical conditions and their impact on an individual's daily life and functional capacity. In Colombia, Decree 917 of 1999 establishes the "Manual Single National Disability Rating," a crucial legal framework designed to standardize the evaluation of permanent partial disability, invalidity, and occupational death. This comprehensive manual ensures a consistent and equitable approach to determining the degree of impairment across various bodily systems. This article delves into the specifics of this decree, focusing on Chapter XIV, which addresses the hematopoietic system, and then expands into Book Two, which outlines the general principles and classification of disabilities. Understanding these guidelines is essential for medical professionals, legal practitioners, and individuals seeking disability benefits, as it provides a clear methodology for assessing functional limitati...