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Test & Collection Guide

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Calcium - Blood

Alternate names:
Ca, Ca++, Total Calcium
Laboratory:
Biochemistry
Test Code:
CA
Specimen types:
Serum
Container types:
Serum tube with gelSerum tube with gel
Collection Instructions:
Transport specimen at Room Temperature to lab
Sample haemolysis may make this test unreportable
Minimum Adult Volume:
1 mL
Paediatric Minimum Volume:
0.5 mL
Frequency:
Daily
Result Turnaround Time:
4 hours
Reference Interval:

2.10 - 2.60 mmol/L

Laboratory Use Only
Storage Instructions:

Serum total calcium rises or falls approximately 0.02mmol/L for each g/L change in serum albumin.

Stasis must be avoided when taking blood as prolonged use of a tourniquet gives falsely raised values, as does haemolysis.

Total calcium can be corrected for low albumin levels using the following formula:

Corrected Calcium = TCa + [(40 - Alb) X 0.02]