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Laboratory Medicine

Test Directory / Calcium


Brown clotted serum, gel barrier or lithium heparin

Common AbbreviationsCa, Cal
ProfileBone, Adjusted Calcium
Tube typeBrown clotted serum, gel barrier or lithium heparin
Clinical IndicationMeasurement of calcium is used in the diagnosis and treatment of parathyroid disease, a variety of bone diseases, chronic renal disease, urolithiasis and tetany.
Specimen TypeBlood
Sample typeSerum
Minimum Volume0.5mL If requesting more than 10 tests please send an additional brown clotted serum sample.
Special PrecautionsNo special requirements
Stability7 days at 15-25°C and 3 weeks at 2-8°C
Turnaround TimeUrgent: 2 hours Inpatient: 4 hours Outpatient/ GP: 24 hours
LaboratoryYork and Scarborough
Reference IntervalAdults: 2.2-2.6 mmol/L (Recommended by Pathology Harmonisation Reference Group) 1 month to 16 years of age: 2.2-2.7 mmol/L <1 month: 2.0-2.7 mmol/L
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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