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Calcium
(a.k.a Bone Profile, Calcium group, Ca)
minimum sample volume required ~ 5ml
Test Code: CA
Tube type: SST
Other acceptable tube types
Lithium heparin (pale green)
Special instructions
Uncuffed sample collection preferred.
Calcium group request includes calcium, albumin, phosphate and alkaline phosphatase (ALP).
For other reference ranges, see individual tests.
Reference range
0 - 28 days: 2.00 - 2.70, 29 days - 15 years: 2.20 - 2.70, 16+ years: 2.20 - 2.60
Units
mmol/L
Linked to
Calcium, Albumin, Phosphate, Alkaline Phosphatase (ALP)
Turnaround Time
1
day
Department: Biochemistry
Clinical Application
Please note: New adjusted calcium equation implemented 23/04/2026 (see below).
Adjusted calcium = Ca + 0.016 x (40-albumin).
Please interpret adjusted calcium concentrations with caution if albumin is <20g/L or >50g/L.
Webpage updated: April 2026.
