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Magnesium

Magnesium Blood Test

Magnesium supports bone density, heart rhythm, and cognitive function — all areas that may need extra attention as you age. Regular monitoring helps maintain quality of life.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Age years

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Your reference range

mmol/l

0,71 0,98 mmol/l

Reference ranges by group, in mmol/l
Age	Reference range (mmol/l)	Relative scale
6 years and older	0,71–0,98 mmol/l	0,71 0,98

0,71 0,98 mmol/l

Source: NVKC Reference population: Nederlandse huisartsenpopulatie (NUMBER, n=7.574.327)

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Magnesium: what this test measures

This test measures the level of magnesium in your blood serum. Since most magnesium is stored inside cells and bones, serum levels may not fully reflect total body magnesium status.

Magnesium: why this value matters

Magnesium supports heart rhythm, muscle relaxation, nerve signalling, and bone health. Deficiency is common and may be associated with muscle cramps, fatigue, and cardiovascular issues. Consult your healthcare provider for personalised advice.

Magnesium: when is testing worthwhile?

Testing may be recommended if you experience muscle cramps, weakness, heart palpitations, or sleep difficulties. Active individuals and those with restricted diets may benefit from regular magnesium monitoring.

Magnesium: symptoms of a high or low value

Low Levels

Symptoms of low magnesium may include muscle cramps, twitching, fatigue, weakness, irritability, sleep disturbances, and heart palpitations.

High Levels

High magnesium is uncommon in healthy individuals but may cause nausea, low blood pressure, muscle weakness, and in severe cases, breathing difficulties. It is usually related to kidney impairment or excessive supplementation.

Magnesium: what to do about an abnormal value

Male

If Low

Low magnesium may cause muscle cramps, fatigue, and heart palpitations. Consider magnesium glycinate supplementation (400 mg daily).

If High

High magnesium is rare but may indicate kidney dysfunction or excessive supplementation. Reduce supplement intake.

Female

If Low

Low magnesium may cause muscle cramps, PMS, and fatigue. Consider magnesium glycinate supplementation (300-400 mg daily).

If High

High magnesium is rare but may indicate kidney dysfunction or excessive supplementation. Reduce supplement intake.

Magnesium: lifestyle and this value

Include magnesium-rich foods such as dark leafy greens, nuts, seeds, whole grains, and dark chocolate. Reducing stress and limiting alcohol and caffeine may also support magnesium levels.

Magnesium: frequently asked questions

Why is magnesium deficiency so common?

Modern diets often lack magnesium-rich foods, and factors like stress, alcohol, and certain medications can deplete magnesium. Soil depletion has also reduced magnesium content in some crops.

Can magnesium help with sleep?

Magnesium may support relaxation and sleep quality due to its role in nervous system regulation. Consult your healthcare provider for guidance on supplementation.

Which form of magnesium is best?

Different forms have different absorption rates and uses. Your healthcare provider can recommend the most appropriate form based on your specific needs.

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Medical reviewer

Medical standards

Dr. Naimi oversees the medical standards behind our content and assessments.

Medical policy

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