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  • Title: Investigation of hypercalcemia.
    Author: Endres DB.
    Journal: Clin Biochem; 2012 Aug; 45(12):954-63. PubMed ID: 22569596.
    Abstract:
    Hypercalcemia is a relatively common clinical finding. Primary hyperparathyroidism, hypercalcemia associated with malignancy and chronic renal failure (with calcium and vitamin D metabolite treatment or tertiary hyperparathyroidism) are the most common causes. Less common causes of hypercalcemia include vitamin D-related (granulomatous diseases, lymphoma, vitamin D intoxication), other endocrine (thyrotoxicosis), medications (milk-alkali, thiazides, lithium) and other causes (immobilization, familial hypocalciuric hypercalcemia). The clinical laboratory is central to the diagnosis and differential diagnosis of hypercalcemia. Its role has expanded from measuring routine chemistry tests such as total calcium, phosphate, creatinine and alkaline phosphate to include quantification of ionized calcium, parathyroid hormone (PTH) and vitamin D metabolites. In spite of this progress, the diagnosis and differential diagnosis of hypercalcemia can be significantly improved by: 1) increasing the availability and utilization of ionized calcium since total and corrected calcium are often inaccurate; 2) establishing more accurate reference intervals for parathyroid hormone by excluding individuals who are vitamin D insufficient or deficient; and 3) harmonizing intact PTH immunoassays.
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