MAGNESIUM

What this test checks

Measures magnesium in your blood. Low magnesium can cause cramps, weakness, and irregular heartbeat; high levels are rare but serious.

Why do people get this test?

Useful when you have muscle cramps, irregular heartbeat, or are on long-term diuretics or proton pump inhibitors (acid-blockers).

When you should consider this test

• Persistent muscle cramps or twitching
• Irregular heartbeat
• Long-term use of acid-blocking medicines

How to prepare

Fasting preferred.