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Magnesium Test

⚠️ Update approaching🔬 Evidence: ModerateInternal Medicine
Diğer adları: Magnesium level, Mg, Serum magnesium
⚠️

Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.

⚡ Key Facts

• Measures blood magnesium level — only about 1% of total body magnesium is in the blood • Normal: 1.7–2.2 mg/dL (0.70–0.95 mmol/L) • Important for muscle, nerve, and heart function • Deficiency may be underdiagnosed because serum levels can appear normal despite depletion

🧪 What Does This Test Measure?

The magnesium test measures serum magnesium, which represents only about 1% of total body stores and is essential for over 300 enzymatic reactions.

📋 Why Is It Ordered?

Ordered for muscle cramps, tremor, heart rhythm disturbances, resistant hypokalemia or hypocalcemia, and medication monitoring.

🔧 Preparation

Fasting is generally not required, though some laboratories may recommend 8-hour fasting.

📊 Reference Ranges

Normal: 1.7–2.2 mg/dL (0.70–0.95 mmol/L) Low: <1.7 mg/dL High: >2.2 mg/dL ⚠️ Reference ranges vary by laboratory.

⬆️ High Values

High magnesium is usually seen in individuals with kidney dysfunction receiving magnesium-containing medications or supplements.

⬇️ Low Values

Low magnesium may be associated with inadequate intake, GI losses, excessive kidney excretion, medications (diuretics, PPIs), or alcohol use.

⚙️ What Can Affect Results?

Medications (diuretics, PPIs, antacids), kidney function, diet, alcohol use, and GI conditions may affect magnesium results.

🔬 Evidence Summary

Moderate evidence: 1 guideline and 5 reviews.

📚 Most Important Studies on This Topic

1

KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease

Guideline· Kidney International · 2024 · PMID: 38490803

2

Magnesium in man: implications for health and disease

Review· Physiological Reviews · 2015 · PMID: 25540137

3

Challenges in the Diagnosis of Magnesium Status

Review· Nutrients · 2018 · PMID: 30200431

✅ Key Takeaways

💡

What you learned: Serum magnesium reflects only a small fraction of total body stores. Normal blood levels do not always exclude deficiency.

⛔

A magnesium result alone cannot confirm or exclude total body magnesium deficiency. Clinical context is important.

🔬 Sources Used on This Page

6 sources · Most recent publication: 2024
📋
Guideline
Expert society and guideline recommendations
1
source
📖
Review
Comprehensive topic evaluation
5
sources
Overall assessment: Evidence level for this topic is moderate. This page is supported by 1 guideline, 5 reviews.

📝 Questions to Ask Your Doctor

Be prepared for your appointment. Add questions to your list.

📋 References

[PMID: 38490803] KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. Kidney International, 2024.
[PMID: 30200431] Challenges in the Diagnosis of Magnesium Status. Nutrients, 2018.
[PMID: 25540137] Magnesium in man: implications for health and disease. Physiological Reviews, 2015.
[PMID: 26404370] Magnesium in Prevention and Therapy. Nutrients, 2015.
[PMID: 26069819] Magnesium basics. Clinical Kidney Journal, 2012.
[PMID: 17804670] Mechanism of Hypokalemia in Magnesium Deficiency. Journal of the American Society of Nephrology, 2007.
Last reviewed: 4/1/2026
Next review: 4/1/2027

🔗 Related Topics

🧪 Potasyum (Mg eksikliği K kaybına yol açabilir)🧪 Kalsiyum🧪 Sodyum🧪 Fosfor🧪 Kreatinin (böbrek fonksiyonu)
⚖️ This page does not replace medical advice. Make treatment decisions with your doctor.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.