

Magnesium, RBC
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Magnesium is an essential mineral vital for hundreds of bodily functions, including muscle and nerve function, blood glucose control, blood pressure regulation, and bone health. While a serum magnesium test measures the amount of magnesium in your blood at a single point in time, the Red Blood Cell (RBC) Magnesium test provides a more accurate reflection of your body's long-term magnesium stores and tissue levels. This is because most magnesium is found within cells, not in the blood plasma. Evaluating RBC magnesium levels can help identify chronic deficiencies that might be missed by standard serum tests, offering a comprehensive insight into your magnesium status for overall health and well-being.
Quick facts
Red blood cells (RBCs)
2–4 business days
No Fasting Required
Licensed physician review and requisition included with every test.

How It Works?

once Test Order is received, Our physicians will review your request and email you the easy-to-follow requisition form.

Find the closest partner location—most are within 2–3 miles—and drop by for a quick, no‑appointment blood draw.

Once your sample is processed, we’ll send your report straight to your inbox within 1–3 business days. Just click the link to view your results anytime.

Have Questions about results? Book a phone or video visit with one of our doctors. They’ll walk you through your report, explain any findings, and recommend next steps