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Choose collection locationBiochemistry · Individual laboratory test
Total calcium includes the calcium bound to proteins and the free fraction that nerves and muscles use. Both contribute to the reported number.
Clinical authorDr Nirupama SabhapathySpecialist Clinical Pathology
Understanding the test
Also called Total Blood Calcium
A calcium measurement can be useful when investigating kidney stones, bone or parathyroid problems, or medicines that affect mineral balance.
Calcium may be checked during investigation of stones, bone symptoms or an abnormal mineral panel.
The combination with parathyroid hormone may help explain persistently abnormal calcium.
Before your sample
Fasting is usually unnecessary for calcium alone. Record the timing of calcium, vitamin D or relevant medicines and ask whether any accompanying tests need an overnight fast.
A clinician takes a small sample of blood from a vein. The laboratory uses serum, the liquid separated from the blood after it clots.
Smart Report
24 hoursLaboratory turnaround
Protein-bound calcium contributes to the result. If total calcium and symptoms appear inconsistent, the clinician may check the albumin level or measure ionized calcium.
From sample to follow-up

Choose your location, add the test to your care bag and select a time. If you are booking for someone else, assign the test to them in checkout.
Choose collection locationLook for Calcium in your report. Use the sample type and collection time when comparing it with an earlier report.
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Check whether your report also includes albumin. A clinician can advise whether the total calcium needs adjustment or confirmation with ionized calcium.
Health packages
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Basic Health CheckupKidney / Renal Profile
Basic Health CheckupBasic Health Checkup
Advanced Health PackagesAdvanced Health Checkup
Advanced Health PackagesExtended Vitamins & Minerals
Advanced Health PackagesExecutive Health Checkup
Advanced Health PackagesObesity Profile
Advanced Health PackagesElite Health Checkup
Advanced Health PackagesExtensive Cardiac Function
Advanced Health PackagesFitness Profile
Advanced Health PackagesMaster Health CheckupPatient questions
Some calcium travels attached to albumin. A change in albumin can change total calcium even when the free fraction is similar. An ionized calcium test answers that more specific question.
Yes. A tourniquet left on too long or a clenched fist during collection can falsely raise total calcium. Staying relaxed with your arm still helps, and if a mildly high value does not fit the rest of the picture, your doctor may simply repeat it or request ionised calcium, which measures the active free fraction.
No. The body will draw calcium out of bone to keep the blood level steady, so bone density can be declining while blood calcium stays unremarkable. Bone health is assessed with imaging and other markers.
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Written by Dr Nirupama Sabhapathy, Specialist Clinical Pathology. Medically reviewed by Dr Joyce Jose, Specialist Clinical Pathology, on .
Catalogue information and AED price checked on 2 November 2026. Clinical suitability, preparation, collection arrangements and turnaround are confirmed for your selected test.