CITRATE, 24-HOUR URINE

What this test checks

Measures citrate, which normally prevents kidney stones from forming. Low citrate predisposes to stones.

Why do people get this test?

Important in recurrent kidney stone investigation — low citrate can be treated.

When you should consider this test

• Recurrent kidney stones
• Detailed stone work-up
• Family history of stones

How to prepare

24-hour urine collection — container provided.