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Urine calcium (24 hour)

Urine tests · also printed as 24h urine calcium, 24 hour urinary calcium, Urinary calcium, Calcium (24h urine), Urine calcium excretion

Typical UK adult range2.5 to 7.5 mmol/24h

Ranges vary between laboratories; the range printed on the report takes precedence.

What this test measures

The total calcium passed in urine over a day. It shows how much calcium the kidney is excreting, which matters for kidney stones and bone conditions.

Why doctors request it

Used in kidney stone clinics and by endocrinologists looking at calcium and parathyroid conditions.

What commonly pushes it up

A high calcium or salt intake
Over-active parathyroid glands
Vitamin D excess
Some inherited kidney conditions
Bed rest and some medicines as a class

What commonly pushes it down

A low calcium intake
Some water tablets as a class
An inherited condition that mimics parathyroid overactivity
An incomplete collection

Everyday reasons for a value outside the range

Diet and salt intake change it a lot
Collection errors are common

About the sample

Every drop for exactly 24 hours; the lab may supply an acid-containing bottle.

Written by a UK consultant physician. Typical UK adult reference ranges; your laboratory's own printed range takes precedence.

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This is an educational summary of results you uploaded. It is not medical advice, a diagnosis or a treatment plan, and it does not replace the doctor who requested the test. If you are worried, or a result is marked outside range, discuss it with your doctor. Written and reviewed by a UK consultant physician. Reference ranges vary between laboratories.