Ionized Calcium LabCorp

The Ionized Calcium test evaluates nonbound calcium, calcium metabolism, physiologically active calcium fraction, hyperparathyroidism, and ectopic hyperparathyroidism. This test is occasionally useful when hypercalcemia coexists with abnormal protein states such as myeloma. This is useful in assessing active calcium fractions in hypoproteinemia and acidosis when calcium is low.