Preventing kidney stone recurrence

After a first kidney stone, roughly half of patients will form another stone within 5 to 10 years if no preventive measures are taken.1 The right changes, sustained, meaningfully reduce that risk.

The three levers

Prevention is built on three pillars - hydration, diet, and (for selected patients) targeted medication. A 2026 systematic review of 31 studies concluded that increased fluid intake and a high-calcium, low-protein, low-sodium diet remain the best-evidenced general measures for preventing stone recurrence.2

Hydration

The single most important measure. Aim for a urine output of around 2.5 L a day.

Diet

Normal dietary calcium, reduced salt, moderate animal protein, attention to oxalate and citrate.

Preventive medication

Potassium citrate, thiazides, and allopurinol for selected patients based on metabolic workup.

Who needs a metabolic workup?

Not every stone former needs extensive investigations. Basic hydration and dietary advice is appropriate for a first stone former with no red flags. A fuller metabolic evaluation is recommended for:1

  • Recurrent stone formers (two or more stones).
  • Young stone formers (first stone under 25 years of age).
  • Stone formers with a strong family history of stones.
  • Patients with a solitary kidney, renal failure, or known risk factors (gout, bowel resection, hyperparathyroidism).
  • Stone former with an identified rare stone type (uric acid, struvite, cystine).

What a metabolic workup looks like

  • 24-hour urine collection (often two collections) measuring volume, pH, calcium, oxalate, citrate, uric acid, sodium, and creatinine.
  • Fasting bloods: calcium, phosphate, uric acid, bicarbonate, electrolytes, kidney function, 25-hydroxy vitamin D, and parathyroid hormone.
  • Stone composition analysis if a stone has been retrieved or passed.

The dedicated metabolic clinic pathway

For recurrent or complex stone formers, Dr Kooner refers into a shared-care pathway with renal physician colleagues who specialise in stone disease. This typically includes:

  • Structured metabolic assessment with 24-hour urine studies.
  • Tailored preventive therapy based on findings.
  • Long-term follow-up - ongoing urology input for any new stones, and regular renal medicine review for prevention.

Realistic expectations

Prevention works best when it is sustained. A 2026 randomised trial of a behavioural fluid-intake adherence programme found that it modestly increased urine volume but did not significantly reduce symptomatic recurrence compared with guideline-based care (hazard ratio 0.96, 95% CI 0.77-1.20) - underlining that the benefit of hydration depends on actually achieving and holding the target, not simply being advised about it.3

For this reason the advice is deliberately simple: a single, clear hydration goal, a small number of achievable dietary changes, and tailored medication only where the metabolic workup indicates.

Related pages

HydrationThe 2.5 L/day target. DietWhat to eat, what to avoid. Preventive medicationWhen tablets help. Stone typesPrevention varies by type.

Patient information brochure

Dietary advice for recurrent stone formers PDF - BAUS patient brochure Fluid input/output chart PDF - BAUS patient brochure

References

  1. Skolarikos A, et al. EAU Guidelines on Urolithiasis. 2025.
  2. Qaseem A, et al. Dietary and pharmacologic management to prevent recurrent nephrolithiasis: a systematic review. Annals of Internal Medicine. 2026.
  3. Scales CD Jr, et al. Prevention of urinary stones with hydration: a randomised clinical trial of an adherence intervention. 2026.

Speak with Dr Kooner's rooms

Arrange a consultation or request a second opinion on an acute stone, a recurrent stone problem, or a recommended procedure.

02 8382 6980 Contact the Clinic