CALCIUM IONISED, SERUM

What this test checks

Total calcium tests measure all the calcium in your blood, but only the 'ionised' (free) form is biologically active. This test measures that active part specifically.

Why do people get this test?

Ordered when total calcium is normal but symptoms suggest a calcium problem, or in critically ill patients where total calcium can be misleading.

When you should consider this test

• Muscle cramps, tingling, or weakness
• Unclear results on standard calcium test
• Kidney disease or parathyroid problems

How to prepare

Fasting preferred.