Living liver donor hepatectomy at our institution routinely includes ultrasound-guided interfascial plane blocks as part of postoperative analgesia. Although these blocks have become increasingly used in donor hepatectomy, their cutaneous sensory distributions and block-related dermatomal coverage have not been systematically evaluated, with only anecdotal reports available in the literature. This prospective observational study aims to assess both the sensory blockade patterns and the early postoperative analgesic performance of interfascial plane blocks administered to living liver donors. Following surgery, all consenting donors receive the institution's standard block protocol. Cutaneous sensory mapping is performed in the post-anesthesia care unit (PACU) at the second postoperative hour. Pain intensity and analgesic requirements within the first 24 hours are also recorded. The study is designed to provide objective data on the dermatomal coverage and postoperative analgesic effects of contemporary ultrasound-guided interfascial plane blocks used in living liver donor surgery.