Magnesium Test
- Category
- Electrolytes
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 2 days
- Fasting
- No Fasting
- Age
- 5+ Years
What Is This Test?
Measures magnesium, a mineral needed for muscle and nerve function, heart rhythm, blood sugar control and bone health.
Why this test is performed?
Detects low magnesium (from diarrhoea, alcohol, diuretics, some antacids, uncontrolled diabetes) or high magnesium (kidney failure). Often checked when calcium or potassium is abnormal.
Who should take this test?
Vomiting, diarrhoea, dehydration, weakness, people on BP medicines or diuretics, kidney or heart conditions.
Test Preparation
No fasting needed.
Medical disclaimer · for information only, not medical advice
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.
Read our Editorial Policy and Medical Review Process.
- Report time: In 2 days
- No fasting
- Report time: In 2 days
- No fasting
Chloride, Urine Test
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Urine sample — preferably first-morning, mid-stream, in a sterile container
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- Report time: In 2 days
- No fasting
Magnesium 24 Hrs Urine Test
Electrolytes
24-hour urine collection in a container provided by the lab (some tests need a preservative)
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60% off
- Report time: In 2 days
- No fasting
Electrolytes (Na/K/Cl) Test
Electrolytes
Blood sample taken from a vein in your arm
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62% off
Frequently asked questions
Muscle cramps, weakness, tremors, irregular heartbeat and, in severe cases, seizures.
No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.
Blood sample taken from a vein in your arm.
Usually within 12–36 hours after the sample reaches the lab. You will receive the report online.
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