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Background: In 1995, Medicare developed the Medicare Functional Classification Level (MFCL) system to classify lower extremity amputees into different categories to guide prosthetic reimbursement based on their potential level of ambulation. Very few clinical tests exist to accurately assist clinicians in determining an amputee’s mobility potential. The purpose of this case study is to demonstrate the use of the AMP in order to provide an objective and appropriate determination of an amputee’s mobility following a unilateral transtibial amputation. Case Description: The patient was a 61 year old male status post left transtibial amputation following a bimalleolar ankle fracture which healed in valgus deformity with nonunion. The AMP was administered three weeks after his amputation. The patient scored at a K3 level and he was subsequently fitted for his prosthesis. Intervention: The patient was seen in physical therapy for 5 visits for lower extremity strengthening, gait training, and various balance training tasks beginning 9 weeks after his amputation. Outcome Measures: Outcome measures used were 10 meter walk test (10 MWT) and the Timed Up and Go (TUG) test. The subject’s gait speed at his initial evaluation was 0.89 m/s and his TUG time was 15.2 seconds. At his final visit his gait speed improved to 1.3 m/s and his TUG time improved to 11.5 seconds. Discussion: This case describes the use of the AMP to determine an amputee’s functional classification level in order to maximize mobility and quality of life after a transtibial amputation. This case also demonstrates that the AMP is a quick and simple way for clinicians to use objective data to determine an amputee’s potential for ambulation.