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Biochemistry Bones & Joints Home collection available

Calcium, Ionized, Serum

Parameters1 tested
SampleBlood
FastingNot required
Report inSame day

How to prepare

No fasting needed

You can eat and drink normally before the test.

Good to know

No special preparation needed.

Medicines

Tell our phlebotomist about any medicines you take. Don't stop them without asking your doctor.

Comfortable clothes

Wear a loose sleeve so the sample can be taken easily from your arm.

How it works

Book onlinePick a time slot
Home visitSealed, sterile kit
Lab testingBarcode tracked
ReportIn same day

About this test

About half of blood calcium is "free" or ionized, and this is the active form. Measuring ionized calcium is more accurate than total calcium when albumin is abnormal or in seriously ill patients.

Why is this test done?

  • Check calcium accurately in critical illness
  • Investigate abnormal total calcium
  • Monitor parathyroid or kidney disease
  • During and after blood transfusions or surgery

Symptoms — when should you get tested?

  • Muscle cramps or tingling around mouth
  • Weakness and tiredness
  • Kidney stones
  • Confusion or irregular heartbeat

Normal range

Adults 1.12 – 1.32 mmol/L

Reference ranges differ slightly between labs, methods, age and sex. Always discuss your report with your doctor.

If your result is high

High ionized calcium is usually due to overactive parathyroid glands or cancer.

Common reasons
  • Primary hyperparathyroidism
  • Cancer spread to bones
  • Excess vitamin D

If your result is low

Low ionized calcium can cause cramps, tingling and heart rhythm problems.

Common reasons
  • Vitamin D deficiency
  • Low parathyroid hormone
  • Kidney failure
  • Pancreatitis or massive blood transfusion

How is the test done?

  1. 1
    Book online

    Choose your slot for home collection or a visit to our centre.

  2. 2
    Blood sample taken

    A trained phlebotomist takes a small blood sample from a vein in your arm with a sealed, single-use needle. It takes about 2 minutes.

  3. 3
    Tested in our lab

    Your barcoded sample is tested on automated machines with strict quality checks.

  4. 4
    Report on WhatsApp

    A pathologist checks the result and the report reaches you on WhatsApp and email.

Frequently asked questions

No fasting is needed for this test. You can eat and drink normally.

Your report is usually ready in same day after the sample reaches our lab. We send it on WhatsApp and email, and you can also download it from the Reports page.

Please call our team to confirm whether home sample collection is available for your location and test.

This test needs a blood sample. No special preparation needed.

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