Characterization Of the Intestinal Microbiome Evolution After Kidney Transplant Donation or Receipt

Inclusion Criteria: * Ability to understand and the willingness to sign a written informed consent document. * Ability and willingness to comply with study protocol requirements. * Completed Verbal Screening Form * Planned kidney donation or planned receipt of a living donor kidney transplant within 28 days from time of written informed consent. * If performance status is known, a score of any of the following: * American Society of Anesthesia (ASA) classification of I (a normal healthy patient), II (a patient with mild systemic disease) or III (a patient with severe systemic disease) * Eastern Cooperative Oncology Group (ECOG) Status Scale grade of 0 (normal activity), 1 (symptoms, but ambulatory) or 2 (in bed \<50% of the time) * Karnofsky Performance Scale (KPS) of 50% (requires considerable assistance and frequent medical care) to 100% (normal, no complaints, no evidence of disease) * English speaking. Exclusion Criteria: * Any condition that, in the opinion of the investigator, might interfere with study objectives or limit compliance with study requirements, including but not limited to: * Known active intravenous drug or alcohol abuse * Psychiatric illness * Social situation * Planned or actual receipt of a deceased donor kidney transplant. * Prior kidney transplant that still requires active immunosuppressive treatment or intervention. * Presence of diverting ileostomy or colostomy.