Serum Magnesium Concentration (Mass Concentration)

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like muscle cramps, weakness, irregular heartbeat, or if you’re at risk for conditions like hypomagnesemia (low magnesium) or hypermagnesemia (high magnesium). It may also be part of routine check-ups or monitoring for certain medical conditions.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the blood draw if instructed by your provider. Bring any medications or supplements you’re taking, as they can affect results.

What the Results Mean

Results are compared to standard reference ranges for healthy adults. Low levels may indicate conditions like malnutrition, kidney disease, or certain medications affecting absorption. High levels could suggest kidney problems, overuse of magnesium supplements, or other metabolic issues.

Common Causes of Abnormal Results

Magnesium imbalances can stem from dietary deficiencies (e.g., poor intake of leafy greens, nuts), chronic illnesses (e.g., diabetes, heart disease), or medications (e.g., diuretics, antibiotics). Your provider will discuss these with you based on your medical history.