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Test & Collection Guide

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Calcium - Urine

Ordering information:

Elevated 24 hour urine calcium may occur due to primary hyperparathyroidism. Low 24 hour urine calcium, where serum calcium is high may be due to familial hypocalciuric hypercalcaemia (FHH). Level is influenced by dietary calcium and supplements. Used in conjunction with the Hammersmith Urine calcium creatinine clearance ratio (not provided).

Laboratory:
Biochemistry
Test Code:
24UCA,CAU
Specimen types:
24 hour Urine
Container types:
24 hour urine - PLAIN bottle
24-hour urine - ACID bottle		24-hour urine - ACID bottle
Collection Instructions:

With restricted Calcium diet, collect specimens for Calcium measurement on days 5 & 6.

Frequency:
Daily
Result Turnaround Time:
4 hours
Reference Interval:

 Urine 2.5 - 7.5 mmol/d

Laboratory Use Only
Storage Instructions:

If a plain bottle is received, post collection acidifiction is required. Add 50 ml of HCl, mix well, and allow to sit for 30 minutes, then mix again before removing aliquot.