Magnesium is a mineral your body uses in hundreds of tasks. These include making energy, building protein, moving your muscles, and repairing DNA, and this test measures how much is in your blood. This test checks your magnesium levels. Your doctor may order it if you have muscle cramps, an uneven heartbeat, or a condition affecting your kidneys or gut.

What is a normal muscle and nerve mineral range?

A typical adult range is around Normal: 1.7–2.2 mg/dL (0.70–0.95 mmol/L) (CLSI / NIH reference). No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison. Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.

Magnesium — What It Means in Your Blood Test

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Magnesium helps your muscles and nerves work, supports your energy, and keeps your heartbeat steady.

A Magnesium result shows how much of this mineral you have available. Since it quietly powers countless jobs, from steady muscles to a calm heartbeat, the number is worth a glance.

Also known as: serum magnesium, Mg, serum Mg, magnesium level, Mg2+

Kept in balance

This isn't a case where higher or lower is better. Your body keeps it in a narrow band, and both directions can matter.

Last reviewed: 2026-08-16

What is Magnesium?

Magnesium is a mineral your body uses in hundreds of tasks. These include making energy, building protein, moving your muscles, and repairing DNA, and this test measures how much is in your blood.

Why is Magnesium tested?

This test checks your magnesium levels. Your doctor may order it if you have muscle cramps, an uneven heartbeat, or a condition affecting your kidneys or gut.

What is a normal Magnesium range?

India: No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison.
Global: Normal: 1.7–2.2 mg/dL (0.70–0.95 mmol/L) (CLSI / NIH reference)

Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.

Source: [Institute of Medicine, 1997]

What does your Magnesium value mean?

There is no widely-accepted set of value bands for this parameter. Compare your result with the reference range printed on your own report, and discuss it with your doctor.

Magnesium in mg/dL and SI units

Showing values in mg/dL. This is display only — your report's own value does not change.

Value (mg/dL)	Same value (mmol/L)
1.7 mg/dL	0.7 mmol/L
2 mg/dL	0.82 mmol/L
2.2 mg/dL	0.91 mmol/L
2.4 mg/dL	0.99 mmol/L

Source: [CLSI, 2010]

What does a high Magnesium result mean?

A high level is uncommon. It can follow too many supplements or reduced kidney function, and may bring low blood pressure and muscle weakness worth discussing with your doctor.

What does a low Magnesium result mean?

A low level can cause muscle cramps, tiredness, and an uneven heartbeat. It can also pull down your calcium and potassium.

What can affect your Magnesium result?

Nuts, seeds, and greens
Alcohol
Kidney clearance
Water pills or acid-lowering drugs
Gut absorption problems

Questions to ask your doctor

About this result

What does my Magnesium result mean for me specifically, given my age and health?
Is my Magnesium in the range that is right for me, not just the lab's general range?

What to do next

Could anything I eat, do, or take have affected my muscle and nerve mineral result?
Is there anything I should do about my Magnesium, or is it fine to leave as it is?

About retesting

Does my Magnesium need to be repeated, and if so, when?
The typical range for Magnesium can vary between labs — should I compare my result against my own lab's printed range?

The bigger picture

Should my Magnesium be looked at together with my Calcium and Ionised Calcium result?
Does my Magnesium connect to any condition I already have, or to anything I have noticed in how I feel?

Frequently asked questions

What is Magnesium?: Magnesium is a mineral your body uses in hundreds of tasks. These include making energy, building protein, moving your muscles, and repairing DNA, and this test measures how much is in your blood. This test checks your magnesium levels. Your doctor may order it if you have muscle cramps, an uneven heartbeat, or a condition affecting your kidneys or gut.
What is a normal muscle and nerve mineral range?: A typical adult range is around Normal: 1.7–2.2 mg/dL (0.70–0.95 mmol/L) (CLSI / NIH reference). No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison. Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
What does a high Magnesium result mean?: A high level is uncommon. It can follow too many supplements or reduced kidney function, and may bring low blood pressure and muscle weakness worth discussing with your doctor.
What does a low Magnesium result mean?: A low level can cause muscle cramps, tiredness, and an uneven heartbeat. It can also pull down your calcium and potassium.
What can affect your Magnesium result?: Several everyday factors can influence it, including Nuts, seeds, and greens, Alcohol, Kidney clearance, Water pills or acid-lowering drugs, Gut absorption problems.

Sources

Institute of Medicine (1997) — Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride

Part of the Minerals

See the full Minerals guide

Related tests in this panel

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