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General Information

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Mayo Clinic Laboratories

Test Code LAB54 CALCIUM, IONIZED, SERUM OR WHOLE BLOOD

Day(s) Performed

Performed: Daily

Routine TAT: Same Day

Available as a STAT test

Intended Use

Assessing calcium states during liver transplantation surgery, cardiopulmonary bypass, or any procedure requiring rapid transfusion of whole blood in neonates and critically ill patients.

Second-order test in the evaluation of patients with abnormal calcium values.

Clinical Summary

Ionized calcium, which accounts for 50% to 55% of total calcium, is the physiologically active form of calcium.

 

Low ionized calcium values are often seen in kidney disease, critically ill patients, or patients receiving rapid transfusion of citrated whole blood or blood products.

Increased serum ionized calcium concentrations may be seen with primary hyperparathyroidism, ectopic parathyroid hormone-producing tumors, excess intake of vitamin D, or various malignancies.

Specimen Collection and Handling

Collect serum in gold top serum separator tube (SST), plain red top tube or lithium heparin whole blood.

Refrigerated transport, do not pouf-off.