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Laboratory Medicine

Test Directory / Ionised Calcium

Ionised Calcium

Brown clotted serum, gel barrier or lithium heparin OR blood gas syringe

TestIonised Calcium
Common AbbreviationsICAL
Tube typeBrown clotted serum, gel barrier or lithium heparin OR blood gas syringe
Clinical IndicationMeasurment of ionised calcium can be useful in patients with alkalosis or acidosis when total calcium measurements may be misleading, and for patients with low albumin levels where the adjusted calcium can't be calculated.
Specimen TypeBlood
Sample typeSerum (Un-cuffed sample)
Minimum Volume4.9mL
Special PrecautionsSample tube must be full with no air bubbles. Samples taken on the wards should be analysed by medical/nursing staff on the blood gas analysers
StabilityMust be tested immediately after opening sample lid
Turnaround TimeInpatient: Must be performed on ward Outpatient/ GP: 24 hours
LaboratoryYork and Scarborough Requires blood gas analyser available on various hospital wards.
Reference Interval 1.15-1.33 mmol/L
LimitationsNo interference was observed from rheumatoid factors up to a concentration of 1200 IU/mL.
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