Collection Notes: Collect blood (2 mL serum) in a gel barrier tube. Allow to clot and then centrifuge immediately with cap on. Do not open tube. Ship the unopened gel barrier tube at room temperature.
Clinical Utility: Ionized calcium provides a measurement of the actual bioavailable calcium in the circulation.
Serum (1 mL)
Ambient 8 Hours
Refrigerated 6 Days
Frozen 8 Months
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