The prevalence of diabetes is sufficiently high to be classified as an epidemic, and 20-40% of these patients are expected to develop diabetic nephropathy, a leading cause of end-stage renal failure. Studies have identified a correlation between diabetic nephropathy and hypoxia in renal tissue in human studies. Increased oxygen consumption has been associated with the proton transport protein, uncoupling protein-2 (UCP-2), which uncouples the mitochondria. Previous research has reported elevated levels of UCP-2 in diabetic renal tissue. Consequently, it is crucial to determine how different preservation methods affect the detectability of UCP-2 in renal tissue for clinical applications. This study aimed to evaluate the effectiveness of Western blotting for detecting UCP-2 in snap frozen, fresh untreated, formalin-fixed, methyl carnoy-fixed, and RNA later-preserved rat kidneys. Preliminary trials were conducted to identify the optimal antibody combinations, followed by testing on various preserved tissues. The antibodies produced non-reproducible, unspecific, and unselective results. Additionally, technical challenges, such as gels adhering to membranes and low protein concentrations in some samples, rendered the results inconclusive. Further investigations are necessary to explore additional antibodies and variables that may influence the detection of UCP-2 in differently preserved tissues. Overall, this study highlights the complexity and challenges in developing reliable protocols for UCP-2 detection in preserved renal tissue, indicating that significant optimization is still required for consistent results.