Long-Term Risk of Kidney Stones in Living Kidney Donors

\*Donors\* Inclusion Criteria: Living kidney donors who underwent donor nephrectomy in Ontario, Alberta, and British Columbia, Canada, between July 1, 1992, and March 31, 2024 are eligible to enter the study. Exclusion Criteria: * Any person with data errors in their database records (such as missing or invalid age; it is expected to exclude very few persons for these reasons). Data errors also include evidence of prior dialysis or a prior solid organ transplant, as such individuals are not eligible to become donors. * Any person who was not a permanent resident of the province (i.e., the patient lives outside of the province, and only came to the province to donate a kidney to the intended recipient). This will include anyone who is not eligible for the province's health insurance plan, anyone whose last contact date in the databases is less than 1 year after the cohort entry date, and anyone without a physician visit in the year following the nephrectomy hospital discharge. * Any person who is \<18 years of age on the date of nephrectomy (as only under exceptional circumstances should a person less than 18 be approved for living donation). * Any person with a history of kidney stones. \*Non-donors\* Inclusion criteria: Before nephrectomy, living donors undergo rigorous health screening. A similarly healthy segment of the general population will be selected using restriction and matching. A random cohort entry date (simulated nephrectomy date) will be assigned to all pe…