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  • Title: Nephrogenous cyclic AMP and plasma parathyroid hormone in hypercalcaemia: the influence of renal function.
    Author: Bill G, Jacquet AF, Burckhardt P.
    Journal: Eur J Clin Invest; 1984 Jun; 14(3):227-32. PubMed ID: 6088250.
    Abstract:
    Immunoreactive parathyroid hormone (PTH) levels and nephrogenous cyclic adenosine monophosphate (cAMP) have been reported to be useful parameters in the diagnosis of hyperparathyroidism. Measurements in hyperparathyroid patients usually give values above the normal range when PTH is measured with a carboxyterminal radioimmunoassay and when nephrogenous cAMP is related to glomerular filtration rate. We tested these two parameters in two groups of hypercalcaemic patients (twelve cases of primary hyperparathyroidism and fourteen cases of hypercalcaemia of non-parathyroid origin) and in two groups of normocalcaemic subjects (twenty-one young healthy volunteers and fourteen elderly subjects without parathyroid disease). Slight impairment of renal function caused elevated values of immunoreactive parathyroid hormone in a carboxyterminal radioimmunoassay and also of nephrogenous cAMP when related to glomerular filtration rate. We found that elevated nephrogenous cAMP without parathyroid disease could be attributed to renal insufficiency and to the mode of expression generally used for the nephrogenous cAMP.
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