Diagnostic test
Calcium-Ionized
About test
What does Calcium-Ionized measure?
The Calcium-Ionized test measures the level of free, biologically active calcium in the blood. Unlike total calcium, it reflects the calcium available for important body functions such as nerve signaling, muscle contraction, and heart rhythm. A healthcare professional may order this test to help evaluate suspected calcium imbalance, parathyroid-related conditions, kidney disorders, or changes in acid-base balance. Results are interpreted along with symptoms and other laboratory findings.
This overview is educational. Use the recorded preparation, sample and lab-partner details below for collection guidance, and confirm any missing information before collection.
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Compare eligible lab partners
Prices, report times and availability are shown from the catalog records for each eligible partner.
Sagepath Labs
- Sample for analysis
- Serum (1 mL)
- Report time
- 11:00/18:00
Preparation and specimen requirements can vary by test and laboratory. Follow the instructions shown for your selected partner and any advice from your healthcare professional.