MAGNESIUM, 24-HOUR URINE

What this test checks

Measures total magnesium in 24-hour urine. Helps diagnose why magnesium levels are abnormal.

Why do people get this test?

Used when blood magnesium is abnormal and the cause needs to be found.

When you should consider this test

• Persistent low blood magnesium
• Investigating kidney mineral handling
• Specialist requested

How to prepare

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