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When ordering Parathyroid Hormone Intact Molecule, TOTAL CALCIUM is needed to produce a result that includes a diagnostic graph which plots parathyroid hormone concentrations against total serum calcium values. This graph is designed to aid in the diagnosis of primary hyperparathyroidism, secondary hyperparathyroidism, hypothyroidism and hypercalcemia of malignancy. It is for this reason that testing laboratories consider the information provided in the PTHI with calcium to be of more value to the physician than the PTHI without the calcium.
If you would prefer to order the PTHI with calcium and have the test without calcium preprinted on the bottom of your MuirLab requisition, please contact your sales representative so that they can make the appropriate changes.
