Magnesium (RBC)
Red blood cell (RBC) magnesium measures magnesium stored inside red blood cells, reflecting long-term magnesium status more accurately than serum magnesium.
Category: Vitamins & Minerals
Also known as: magnesium, rbc
Reference range: 4–6.4 mg/dL (Source: ABIM)
Standard unit: mg/dL
High values may indicate
Elevated RBC magnesium may indicate excessive magnesium supplementation.
Low values may indicate
Low RBC magnesium may indicate magnesium deficiency even when serum levels are normal.
Frequently asked questions
- What is a normal Magnesium (RBC) level?
- A typical reference range for Magnesium (RBC) is 4–6.4 mg/dL (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Magnesium (RBC) measured in?
- Magnesium (RBC) is most commonly reported in mg/dL. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Magnesium (RBC) reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Magnesium (RBC) over time?
- Yes. Upload results from any lab and BloodId charts your Magnesium (RBC) over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: BloodId admin-reviewed
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