Magnesium Serum Magnesium
A mineral your muscles, nerves and sleep all depend on.
Also printed asMg · Mag
What it measures
A mineral used by several hundred enzymes, most of it stored in bone and muscle rather than blood.
Affects sleep quality, muscle cramping, blood pressure and insulin sensitivity; the blood level understates a shortfall.
Why it matters for how long you stay well
It sits behind hundreds of everyday chemical steps including how insulin works, and low intake is common in diets built on polished grains rather than nuts, seeds and greens.
How it shows up in daily life
Running low can show up as night cramps, twitchy eyelids, poor sleep and a low mood you cannot pin on anything.
High and low readings
When it reads high
Reduced kidney clearance, or supplements.
When it reads low
Cramps and poor sleep; common with a low intake or with diuretics.
What moves it
Daily life
- nuts, seeds, whole grains and dark green vegetables
- alcohol, which wastes it
- loose motions
- poorly controlled blood sugar
Medicines known to shift it
- PPIs (lower it)
- diuretics (lower it)
Listed so a result can be read in context. It is not advice to start, stop or change any medicine; that decision belongs with your physician.
Common questions
What does Serum Magnesium measure?
A mineral used by several hundred enzymes, most of it stored in bone and muscle rather than blood. Affects sleep quality, muscle cramping, blood pressure and insulin sensitivity; the blood level understates a shortfall.
What does a high Magnesium result usually mean?
Reduced kidney clearance, or supplements.
What does a low Magnesium result usually mean?
Cramps and poor sleep; common with a low intake or with diuretics.
What is the usual reference range for Magnesium?
A broad adult reference band is 1.7–2.4 mg/dL. Labs differ, so read your result against the band printed on your own report.
Educational only, not a diagnosis. A single number means little without your history and the rest of your panel, so discuss your own results with your physician.
Typical adult reference band
- Adults
- 1.7–2.4 mg/dL
Labs differ. The band printed on your own report is the one that applies to your result.
Reported in mg/dL, mmol/L
Ageing relevance
3/5
A moderate ageing association; used in clinical longevity panels.
Worth knowing
Most of your magnesium is inside cells and in bone, so a normal blood level does not prove your stores are full.
Have a report with this marker on it? Read it in context.
Upload it to Oraia, our health-intelligence tool, for a plain-language read of your markers that a Genoryx doctor can review.
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