24-Hour Magnesium Intake Assessment

What This Test Measures

The test quantifies the total magnesium ingested from all food and beverages consumed in one full day. It does not measure magnesium levels in your body fluids or tissues but focuses on dietary intake alone.

Why It’s Done

Your doctor may order this test if you have symptoms suggestive of magnesium deficiency (such as muscle cramps, fatigue, or irregular heartbeat) or if you’re on a diet requiring careful magnesium monitoring (e.g., kidney disease, certain medications). It can also help assess dietary habits in patients with suspected deficiencies or those following specific dietary plans.

How It’s Done

You’ll be asked to keep a detailed record of everything you eat and drink for 24 hours, including portion sizes. A healthcare provider may provide a diary or instructions to simplify tracking. No blood or lab specimen is drawn for this test—it relies solely on dietary reporting.

What the Results Mean

Results are typically reported as the total magnesium intake in milligrams (mg) per day. While reference ranges vary by age and gender, lower-than-expected intake may indicate poor dietary habits or deficiencies, while higher intake may suggest excessive consumption (e.g., from supplements or certain foods).