Clarilab

Kidney and electrolytes

Magnesium test

A mineral needed for muscles, nerves and heart rhythm.

Typical range
1.7–2.2 mg/dL.
Usual recheck
About 1 month when out of range

Why it's done

Checked with cramps, palpitations, low potassium or calcium, or long-term acid-reducing medicines.

What a high result can mean

Kidney disease or too many supplements or antacids.

What a low result can mean

Diarrhoea, alcohol, diuretics or long-term PPI use.

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More kidney and electrolytes tests

Kidney function test (KFT)Creatinine, urea or BUN, uric acid, eGFR and usually electrolytes. CreatinineA waste product from muscles, cleared by the kidneys. eGFRAn estimate of how much blood your kidneys filter each minute, worked out from… UreaA waste product from protein breakdown, cleared by the kidneys. BUNThe nitrogen part of urea (urea ≈ BUN × 2.14). Uric acidA waste product from purines in food and cells.