ca ionized (ionized calcium)
ElectrolyteBlood sampleResults 24 hrsNo fasting
Ca Ionized (Ionized Calcium)
Ionized calcium measures the active, free form of calcium in your blood that isn't bound to proteins. It gives a precise picture of calcium status, useful when total calcium results are unclear or affected by protein levels.
Sample
Blood
Results
24 hrs
Fasting
Not required
Follow-up
Optional add-on
What this test detects
Ionized calcium
Ion-selective electrode · serum
Quantitative · mmol/L
When to get this test
Parathyroid and calcium disorders
Helps assess suspected hyperparathyroidism or hypoparathyroidism when calcium regulation is in question.
Critical illness monitoring
Preferred over total calcium when albumin or blood pH levels may distort total calcium readings.
Symptoms of calcium imbalance
Useful when there are muscle cramps, tingling, or other signs of high or low calcium.
How to prepare
01
No special preparation needed.
Common questions
How is ionized calcium different from total calcium?
Total calcium includes calcium bound to proteins like albumin, while ionized calcium measures only the free, biologically active portion. Ionized calcium can be more accurate when protein levels are abnormal.
What can affect my result?
Blood pH, albumin levels, and certain medications can influence ionized calcium. Your healthcare provider will interpret the result alongside your overall picture.