Kidney stone compositions and frequencies in a Norwegian population

AbstractObjectives: The aim of this study was to investigate frequencies of kidney stone constituents in a Norwegian population and examine trends over time by comparing with an earlier study of this population.Materials and methods: Upper urinary tract calculi consecutively collected from patients who underwent stone surgery at Akershus University Hospital from July 2014 to December 2017, in total 1252 calculi, were analysed by infrared spectroscopy. The results were compared with a study of 500 calculi collected from June 1975 to September 1980 at the same hospital.Results: The male:female ratio was 1.83:1. Single-component stones constituted 39%, 35% were binary, and 25% ternary. Main stone component frequencies were oxalate 71.3%, calcium oxalate monohydrate 53.7% with higher occurrence in males, calcium oxalate dihydrate 17.6%, carbonate apatite 10.8% and struvite 5.7%, both with higher occurrence in females, uric acid 8.9% with a non-significant male predominance, brushite 1.6% and cystine about 1%....