Ionised Calcium

This Test measures the level of free (unbound) calcium in the blood, which is the biologically active form of calcium used by the body. Unlike total calcium, ionised calcium is not affected by protein levels, making it a more accurate indicator of calcium status.

Calcium plays a vital role in muscle contraction, nerve function, blood clotting, and bone health. Abnormal ionised calcium levels may indicate conditions such as parathyroid disorders, kidney disease, vitamin D imbalance, or critical illness.

The purpose of this test is to:

• Measure active (ionised) calcium levels in the blood
• Assess calcium metabolism accurately
• Diagnose parathyroid and metabolic disorders
• Monitor critically ill patients or calcium-related conditions

IONISED CALCIUM Test

The Ionised Calcium test measures the amount of free or ionised calcium in the blood. This is the biologically active form of calcium that is directly available for important functions such as muscle contraction, nerve signaling, blood clotting, and normal heart function.

Unlike total calcium, which includes calcium bound to proteins such as albumin, ionised calcium measures the calcium that is actively available to the body's tissues. Therefore, it can provide a more direct assessment of calcium status when total calcium results may not accurately reflect the body's active calcium levels.

The test may be used to evaluate high or low calcium levels, parathyroid disorders, kidney disease, bone disorders, and disturbances in calcium metabolism. It may also be useful in critically ill patients or when changes in blood protein levels or pH can affect total calcium measurements.

This Test is Recommended for Individuals:

• With suspected high or low calcium levels
• Being evaluated for parathyroid gland disorders
• With symptoms such as muscle cramps, tingling, weakness, or abnormal heart rhythm
• With certain kidney or bone disorders
• Being evaluated for abnormalities in calcium metabolism
• Who are critically ill or have conditions that may affect calcium balance
• When total calcium results do not adequately explain the clinical symptoms

FAQs

1. What is the Ionised Calcium test?
The Ionised Calcium test measures free calcium in the blood, which is the biologically active form responsible for several important functions in the body.

2. What is the difference between ionised calcium and total calcium?
Total calcium includes both protein-bound and free calcium, whereas ionised calcium measures only the free, biologically active form. Ionised calcium may therefore provide a more accurate assessment of calcium status in certain clinical situations.

3. What can abnormal ionised calcium levels indicate?
Low or high ionised calcium levels may be associated with conditions affecting the parathyroid glands, kidneys, bones, vitamin D metabolism, or overall calcium regulation. Results should be interpreted along with symptoms and other laboratory findings by a healthcare professional.