Calcium Ionised Serum Test
- Category
- Bone & Joint
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 2 days
- Fasting
- No Fasting
- Age
- All Ages
What Is This Test?
Measures ionised (free) calcium — the active part of calcium in the blood that is not bound to proteins.
Why this test is performed?
More accurate than total calcium in critical illness, kidney disease, low albumin, after surgery or blood transfusion, and in parathyroid disorders.
Who should take this test?
Joint or bone pain, swelling, stiffness, gout, osteoporosis risk, women after menopause and older adults.
Test Preparation
No fasting needed.
Medical disclaimer · for information only, not medical advice
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
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- Report time: In 30 days
- No fasting
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Blood sample (EDTA tube); some genetic tests also accept saliva, tissue or other samples
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- Report time: In 30 days
- No fasting
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- Report time: In 2 days
- No fasting
- Report time: In 5 days
- No fasting
Frequently asked questions
Total calcium can be misleading when protein levels are abnormal; ionised calcium shows the true active level.
No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.
Blood sample taken from a vein in your arm.
Usually within 13–37 hours after the sample reaches the lab. You will receive the report online.
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