This case study examines the application of the Clinical Reasoning Cycle (CRC) in the nursing care of Mr. Brad Taylor, a 28-year-old patient admitted to the High Dependency Unit (HDU) with diabetic ketoacidosis (DKA). The assessment begins with a review of the patient's history, vital signs, and presenting symptoms, including elevated blood glucose, ketone levels, and signs of metabolic acidosis. The CRC framework guides the identification of three primary nursing problems: impaired fluid balance, insufficient insulin, and metabolic acidosis. The study then outlines the establishment of SMART goals, followed by detailed nursing interventions, including fluid and electrolyte replacement, insulin therapy, and strategies to prevent metabolic acidosis. The evaluation demonstrates the effectiveness of the interventions, showing normalization of blood glucose levels, vital signs, and urine analysis results. The reflection highlights the importance of evidence-based practice, family involvement, and ethical considerations in providing holistic, patient-centered care for patients with DKA. The conclusion emphasizes the critical role of the CRC in guiding clinical decision-making and promoting positive patient outcomes in this medical emergency.