Clarilab

Kidney and electrolytes

Urea test

Also called blood urea

A waste product from protein breakdown, cleared by the kidneys.

Typical range
15–45 mg/dL.
Usual recheck
About 3 months when out of range

Why it's done

Part of the KFT.

What a high result can mean

Dehydration, high-protein diet, bleeding in the gut or reduced kidney function.

What a low result can mean

Low protein intake or liver disease.

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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… BUNThe nitrogen part of urea (urea ≈ BUN × 2.14). Uric acidA waste product from purines in food and cells. Urine albumin (UACR)Small amounts of protein (albumin) leaking into urine.