PHOSPHORUS, 24-HOUR URINE

What this test checks

Measures phosphorus in urine collected over 24 hours. Helps diagnose causes of bone or kidney problems.

Why do people get this test?

Used in evaluating bone disease, kidney stones, and parathyroid disorders.

When you should consider this test

• Recurrent kidney stones
• Bone disease work-up
• Suspected parathyroid problem

How to prepare

24-hour urine collection required — container and instructions provided.