Clarilab

Kidney and electrolytes

Sodium test

Also called Na

A salt that controls fluid balance.

Typical range
135–145 mmol/L.
Usual recheck
About 1 month when out of range

Why it's done

Part of electrolytes; checked with vomiting, diarrhoea, weakness or some medicines.

What a high result can mean

Usually dehydration.

What a low result can mean

Diuretics (water pills), vomiting, drinking too much water, or hormone problems. Very low levels cause confusion.

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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.