Inclusion Criteria:  Willing to provide informed consent The patient is ≥ 18 years Patients presenting to UW Health who have had or will have unilateral or bilateral mastectomy (therapeutic or prophylactic) and are planning to undergo autologous reconstruction with TRAM/DIEP will be included  Exclusion Criteria:  Patient is non-English speaking Patient is known or believed to be pregnant Patient is a minor (individuals <18 years old) Patient is a prisoner Individuals unable to give consent due to another condition such as impaired decision-making capacity Autologous reconstruction where the flap is buried (e.g. there is no autologous skin exposed for sensation testing) Patient is a male Any patient with: diabetic neuropathy, thyroid disorders, collagen vascular disease, alcoholism, pernicious anemia, or any other severe underlying peripheral neuropathy Women with recurrent breast cancer Women who have undergone previous breast reconstructive procedures Not suitable for study participation due to other reasons at the discretion of the investigators Patient is currently lactating History of radiation therapy Patient undergoing a latissimus dorsi flap for reconstruction Patient undergoing alloplastic reconstruction