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  • Title: [Familial hypocalciuric hypercalcemia].
    Author: Tóth M, Speer G, Patócs A, Salamon D, Lakatos P, Rácz K, Tulassay Z.
    Journal: Orv Hetil; 2003 Oct 12; 144(41):2029-31. PubMed ID: 14631896.
    Abstract:
    INTRODUCTION: Familial hypocalciuric hypercalcemia is often considered but rarely proved during evaluation for hypercalcemia. The disorder is characterized by lifelong persisting hypercalcemia and hypocalciuria. CASE REPORT: In this study, the authors analyzed a 25-yr-old Hungarian woman with mild hypercalcemia detected by routine laboratory testing. Evaluation revealed hypercalcemia, relative hypocalciuria and non-suppressed serum intact parathormone level. The diagnosis of hypocalciuric hypercalcemia was confirmed by the low ratio of calcium clearance/creatinine clearance. Genetic studies for calcium-sensing receptor gene mutations were performed in blood DNA samples. After polymerase chain reaction amplification, DNA sequencing of exons 2-7 were performed. The proband and her father had the same mutation (CCG-->CTG) at codon 55 of exon 2, leading to a conversion of the proline to a leucine. DISCUSSION: This case report presents the first case of familial hypocalciuric hypercalcemia, published in a Hungarian patient.
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