Evaluates the total calcium, ionized calcium, and parathyroid hormone to further define the cause of abnormalities in calcium homeostasis.
Interferences: Marked hemolysis and lipemia may cause interference with testing.
Note: Serum samples must be anaerobically obtained (exposure to air may artifactually decrease ionized calcium). Samples should not be transported in serum separator tubes. Transfer serum into two plain red top tubes and label as serum ionized calcium and serum PTH. Samples should be frozen and sent on ice.