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The Magnesium test measures the level of magnesium — the fourth most abundant mineral in the body and a cofactor in over 300 en...
Also known as: Serum Magnesium Test · Mg2+ Blood Test · Magnesium Level Test · Serum Mg Test
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*Inclusive of home collection charges
The Magnesium test measures the level of magnesium — the fourth most abundant mineral in the body and a cofactor in over 300 enzymatic reactions — in your blood. Magnesium is essential for heart rhythm, muscle contraction, nerve transmission, blood sugar regulation, and bone health. Deficiency (hypomagnesaemia) is surprisingly common and often goes undetected, yet it significantly increases the risk of arrhythmias, muscle cramps, anxiety, and poor diabetes control. No fasting required.
Key benefits of this package include:
What Does the Magnesium Test Measure?
| Level / Result | Possible Interpretation |
|---|---|
| 1.7–2.2 mg/dL (Normal) | Adequate magnesium status — normal cardiac and neuromuscular function |
| 1.2–1.7 mg/dL (Mild hypomagnesaemia) | Mild deficiency — fatigue, muscle cramps, irritability; dietary review and supplementation may be needed |
| 0.8–1.2 mg/dL (Moderate hypomagnesaemia) | Significant deficiency — tremors, palpitations, anxiety, poor glucose control; medical management required |
| < 0.8 mg/dL (Severe hypomagnesaemia) | Critical — risk of seizures, tetany, ventricular arrhythmias; IV magnesium replacement required urgently |
| 2.2–2.9 mg/dL (Mild hypermagnesaemia) | Mild excess — usually asymptomatic; often from excessive supplementation or mild kidney impairment |
| 3.0–4.9 mg/dL (Moderate hypermagnesaemia) | Nausea, flushing, drowsiness, hypotension; stop supplementation; medical review required |
| > 4.9 mg/dL (Severe hypermagnesaemia) | Critical — respiratory depression, cardiac arrest risk; emergency treatment required |
Important Note: Serum magnesium can appear normal even when total body magnesium is significantly depleted — because the body maintains serum levels at the expense of cellular and bone stores. A low-normal serum magnesium in a symptomatic patient warrants clinical investigation. Results must be interpreted alongside potassium, calcium, and clinical symptoms by a physician.
The Magnesium-Potassium Connection: One of the most clinically important relationships in electrolyte medicine is between magnesium and potassium. Hypomagnesaemia causes renal potassium wasting — making it impossible to correct hypokalaemia without first correcting magnesium. This is why persistently low potassium that does not respond to supplementation should always prompt a magnesium check. The same applies to calcium — magnesium is required for PTH secretion and action, so severe hypomagnesaemia can cause hypocalcaemia that also fails to respond to calcium supplementation alone.
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