Fluid intake should be at least 2.5 to 3 L per day for adults, and 1-2 L a day for children and young people (depending on age) to prevent stone formation.[15]Agarwal MM, Singh SK, Mavuduru R, et al. Preventive fluid and dietary therapy for urolithiasis: an appraisal of strength, controversies and lacunae of current literature. Indian J Urol. 2011 Jul;27(3):310-9.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3193729
http://www.ncbi.nlm.nih.gov/pubmed/22022052?tool=bestpractice.com
[16]Borghi L, Meschi T, Schianchi T, et al. Urine volume: stone risk factor and preventive measure. Nephron. 1999;8(suppl 1):31-7.
http://www.ncbi.nlm.nih.gov/pubmed/9873212?tool=bestpractice.com
In patients that are known stone formers, a target urine output of 2.0 to 2.5 L per day is recommended; intake volume may need to be even higher (up to 4 L per day).[17]Pearle MS, Goldfarb DS, Assimos DG, et al. Medical management of kidney stones: AUA guideline. J Urol. 2014 Aug;192(2):316-24.
https://www.auajournals.org/doi/10.1016/j.juro.2014.05.006
http://www.ncbi.nlm.nih.gov/pubmed/24857648?tool=bestpractice.com
[18]Cheungpasitporn W, Rossetti S, Friend K, et al. Treatment effect, adherence, and safety of high fluid intake for the prevention of incident and recurrent kidney stones: a systematic review and meta-analysis. J Nephrol. 2016 Apr;29(2):211-9.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4831051/
http://www.ncbi.nlm.nih.gov/pubmed/26022722?tool=bestpractice.com
[19]Bao Y, Tu X, Wei Q. Water for preventing urinary stones. Cochrane Database Syst Rev. 2020 Feb 11;(2):CD004292.
https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD004292.pub4/full
http://www.ncbi.nlm.nih.gov/pubmed/32045491?tool=bestpractice.com
Patients with nephrolithiasis should also be advised to follow a low-protein diet, and a low-sodium diet to prevent nephrolithiasis.[16]Borghi L, Meschi T, Schianchi T, et al. Urine volume: stone risk factor and preventive measure. Nephron. 1999;8(suppl 1):31-7.
http://www.ncbi.nlm.nih.gov/pubmed/9873212?tool=bestpractice.com
[47]Wang Z, Zhang Y, Wei W. Effect of dietary treatment and fluid intake on the prevention of recurrent calcium stones and changes in urine composition: a meta-analysis and systematic review. PLoS One. 2021 Apr 19;16(4):e0250257.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8055022
http://www.ncbi.nlm.nih.gov/pubmed/33872340?tool=bestpractice.com