Definition
What Magnesium measures
Serum magnesium is the small circulating fraction of total body magnesium. Most magnesium lives inside cells, so the blood number can look quiet while stores are low.
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Kidney & electrolytesEssentialCompletemg/dL
Magnesium
A tightly held mineral that still belongs on a chemistry panel
Illustrative sample band · Synthetic
2.1mg/dL
1.5Sample target 1.8–2.3 mg/dL2.7
Why it matters
How clinicians usually read it
Tasso+ liver-chemistry work showed magnesium concordance on centrifuged capillary serum. It is a standard chemistry add-on next to calcium and phosphate.
When it reads low
A lower value can mean
A lower magnesium can follow GI loss, diuretics, alcohol, or poor intake. Symptoms and medications matter more than a small dip.
When it reads high
A higher value can mean
A higher magnesium is less common and can follow supplements or reduced kidney clearance. Confirm kidney function before reacting to one value.
Questions for a clinician
Bring the number into a real conversation
01
Is this low enough, with my symptoms, to treat?
02
Could a medication or alcohol be wasting magnesium?
03
Should we also look at potassium and kidney function?
Educational boundary
Educational information only. Displayed ranges are illustrative sample bands, not a diagnosis, treatment plan, or substitute for the contracted laboratory report and a qualified clinician.
See it as a sample result
The sample dashboard shows an illustrative reading, target band, and trend for Magnesium.