BACKGROUND:

Kidney stones are often found incidentally in potential renal donors and there is a concern that they may become symptomatic and cause damage in the remaining kidney. We herein review kidney donors with asymptomatic small stones and survey them several years after donation looking for evidence of stone events.

METHODS:

The subjects were kidney donors at our center with pre-donation asymptomatic renal calculi. We reviewed pre-donation CT reports from 2005 to 2010 looking for incidental findings of kidney stones. An invitation to join the study was sent to those donors 5 or more years after donation, hoping to capture reports of any stone events. A phone survey was completed asking about issues related to kidney stones such as have you been told about a kidney stone or have you passed a kidney stone. Our center's IRB approved the study.

RESULTS: We identified 20 donors with incidental renal calculi and we were able to contact 18 of these donors more than 5 years after donation (mean 6 years, range 5-8 years). Five had bilateral stones at time of donation and the others donated the stone-bearing kidney. Each patient had an average of 1.5 stones which were 2.4 mm in size (range 1-6 mm). After a 6 year follow up our donors with asymptomatic stones did not report any stone events. Donors that donated the stone-bearing kidney and those who kept a stone-bearing kidney fared equally well.

Conclusion: This is the longest follow up study to date to show that donors with small incidental renal calculi do not progress to symptomatic stone disease 6 years after donation. This may have positive ramifications for donor acceptance criteria.

CITATION INFORMATION: Serur D, Charlton M, Juluru K, Salama G, LoCastro E, Bretzlaff G, Hartono C. Long Term Follow Up of Kidney Donors with Asymptomatic Renal Stones. Am J Transplant. 2016;16 (suppl 3).

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