Understanding the marker
Magnesium supports many chemical reactions and helps muscles, nerves and the heart function. The blood level does not measure all of the magnesium stored in the body.
Serum magnesium is useful when deficiency, excess or a related clinical problem is suspected. A normal serum value does not establish that total body stores are adequate. Kidney function, medicines and gastrointestinal losses affect interpretation.
What does high Magnesium mean?
High magnesium is assessed with kidney function and any magnesium-containing medicines or supplements. Significant elevations can affect muscle and heart function and need prompt medical assessment.
What does low Magnesium mean?
Low magnesium is assessed with intake, absorption, fluid losses, kidney function and any medicines. The actual level and symptoms determine how promptly it needs attention; a blood result alone does not identify the cause.
Panels that measure Magnesium
Kidneys & Electrolytes
Gym Health
Plant-Based Living
Energy & Fatigue Plus
Northstar
Runner's Health
Fitness Premium
Vitals Max
Founders Panel Plus
More markers in the same area
- Vitamin D (25-OH)the blood measure used to assess vitamin D supply
- Vitamin B12needed for nerves and red cells
- Folate (B9)helps your body make new cells
- Vitamin A (Retinol)for vision, immunity, and skin
- Vitamin E (alpha-Tocopherol)a vitamin that helps protect cell membranes
- Holotranscobalaminthe portion of B12 available for cells to take up
This is general information about the marker, not an assessment of your values and not medical advice. Last updated: October 2026.