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Urol Ann. 2020 Jan-Mar;12(1):42-48. doi: 10.4103/UA.UA_161_18. Epub 2019 Nov 7.

The effect of the body mass index on the types of urinary tract stones.

Author information

Department of Surgery, Division of Urology, College of Medicine and King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia.
College of Medicine, King Saud University, Riyadh, Saudi Arabia.
College of Medicine, Immam University, Riyadh, Saudi Arabia.



Urinary tract stones are a common public health problem worldwide. In addition, identifying the composition of stones is important for the further metabolic evaluation of patients. We conducted this study to further correlate the relationship between body mass index (BMI) and different compositions of urinary tract stones.

Materials and Methods:

A retrospective study of 433 patients who underwent urinary tract stone analysis via Fourier-transform infrared spectroscopy at King Khalid University Hospital in Riyadh from May 2015 to June 2017 was performed. Their BMI at the time of stone analysis was recorded.


A total of 433 stones were analyzed by the statistical data analysis software. The BMI was classified according to the WHO classification. We divided our patients into seven age groups. Most patients were between the age group of 35 and 44 years and were overweight. The incidence of calcium oxalate, carbonate apatite, and uric acid stones was higher in patients with a BMI above thirty than in patients with a lower BMI. However, cystine stones were more common in normal-weight patients.


In this study, we found that the incidence of certain types of stones, such as calcium oxalate, cystine, and uric acid stones, in Saudi Arabia can be predicted by BMI measurement.


Body mass index; calcium oxalate stones; urinary tract stones; urolithiasis

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