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Laboratory Medicine

Test Directory / Urine Calcium

Urine Calcium

Acidified 24 hour urine container

TestUrine Calcium
Common AbbreviationsUCAL
Tube typeAcidified 24 hour urine container
Clinical IndicationEvaluation of urine calcium excretion levels can aid in the differential diagnosis of recurrent renal calculi, as well as in the differentiation of familial hypocalciuric hypercalcemia from asymptomatic primary hyperparathyroidism.
Specimen TypeUrine
Sample typeAcidified 24 hour urine
Minimum VolumeNA
Special PrecautionsNo special requirements
Stability4 days at 2-8°C and 2 days at 15-25°C
Turnaround TimeInpatient: 6 hours Outpatient/ GP: 24 hours
LaboratoryYork and Scarborough
Reference Interval2.50 - 7.50 mmol/24hours (Recommended by the Pathology Harmonisation Reference Group)
LimitationsCare should be taken when interpreting calcium results from patients who have received gadolinium containing contrast medium within the previous 24 hours, especially if the patient has impaired renal function. These samples should be assayed using a non-colourimetric technique (e.g. ion selective electrode) or the sample should be drawn prior to administration of such contrast media.
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