What are target values in 24h urine for stone prevention?

Targets: urine volume >2.5 L/day, calcium 450 mg/day (men) / >550 mg/day (women), pH 6.0-7.0 (calcium stones) or <6.0 (uric acid).

What abnormalities are most common in stone formers?

Hypercalciuria (50-60%), hypocitraturia (40-50%), hyperoxaluria (10-15%), hyperuricosuria (10-15%), and low urine volume (universal modifiable risk factor).

When is 24h urine collection indicated?

24h urine is indicated for: first stone with metabolic risk factors, recurrent stone former (>=2 stones), bilateral stones, nephrocalcinosis, stone in solitary kidney, and family history.

Nephrolithiasis 24-Hour Urine Stone Risk

Evaluate 24-hour urine collection parameters for nephrolithiasis risk: calcium, oxalate, uric acid, citrate, pH, and volume to guide prevention therapy.

Use the full interactive calculator below, or

Related Calculators

URS Stone Burden Outcome

Hyper-niche Medical

Nephrolithiasis 24-Hour Urine Stone Risk

Related Calculators

Frequently Asked Questions

What are target values in 24h urine for stone prevention?

What abnormalities are most common in stone formers?

When is 24h urine collection indicated?