Metabolic
Magnesium
LOINC 19123-9 · mg/dL
Ranges
Reference range: 1.7–2.2 mg/dL
What it is
Magnesium is a mineral involved in hundreds of body processes, including muscle and nerve function, energy and a steady heartbeat.
Why it matters
It helps assess nutrition, kidney function and the causes of muscle cramps, fatigue or heart-rhythm issues.
What high values can mean
A higher value is uncommon and is most often related to reduced kidney function or supplements.
What low values can mean
A lower value can cause cramps, fatigue or palpitations and may follow poor intake, gut losses or some medications.
How to improve it
For low magnesium, magnesium-rich foods and addressing the cause (and supplements if advised) restore levels.
Food & lifestyle
Nuts, seeds, legumes, whole grains and leafy greens are rich in magnesium.
Preparing for the test
A blood test; fasting is not usually required — follow your lab's instructions.
When to talk to a doctor
Discuss a persistently low or high magnesium with a doctor, especially with cramps or palpitations.
Related markers
Sources
- MedlinePlus (NIH)
- NIH Office of Dietary Supplements
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
See your own values in context
Bllod turns your lab report PDFs into clear, tracked results — every marker organized, explained, and charted over time.