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IONIZED CALCIUM

Special Instruction : No fasting required
Parameters covered : 1
Sample(s) required : Serum, Serum (3 ml)
₹500 ₹650
Home Collection
Lab Visit

Parameters (1)

Overview

Ionized Calcium

Ionized Calcium

The Ionized Calcium test measures the amount of free, biologically active calcium in your blood.2 Calcium exists in three forms in the blood: bound to proteins (mostly albumin), bound to anions (like phosphate and citrate), and the ionized (free) form.


The ionized form is the most important because it is the form that is physiologically active, meaning it is directly responsible for essential functions like:

  • Muscle Contraction: Including the heart.

  • Nerve Function: Transmitting nerve impulses.
  • Blood Clotting
  • Hormone Release

Because the ionized calcium level is not affected by changes in albumin (unlike the Total Calcium test), it provides a more accurate assessment of a patient's true calcium status, particularly in those who are critically ill or have kidney failure.

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Pre-test Information
No fasting required
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Frequently asked questions on " Ionized Calcium "

The levels are tightly controlled by the body through the interaction of three main hormones: Parathyroid Hormone (PTH): Released when calcium is low, it increases blood calcium. Vitamin D (Calcitriol): Works with PTH to increase calcium absorption from the intestines. Calcitonin: Released when calcium is high, it lowers blood calcium

Total Calcium measurement includes both bound and free calcium.If a patient has low albumin (common in critical illness, malnutrition, or kidney disease), their Total Calcium will appear low, even if their Ionized Calcium is perfectly normal. The Ionized Calcium test bypasses the need for complex corrections and provides the true, active calcium level.

No special preparation required

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