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Diurnal variations in the plasma concentration of parathyroid hormone in dogs
I López1, E Aguilera-Tejero, J C Estepa
1Departamento Medicina y Cirugía Animal, Universidad de Córdoba, Campus Rabanales, Ctra Madrid-Cádiz km 396, 14014 Córdoba, Spain.
Abstract:
The plasma concentrations of parathyroid hormone (PTH), ionised calcium (Ca(2+)), total calcium, albumin and inorganic phosphorus, and the pH were measured in blood samples obtained from nine dogs during a period of 26 hours. The plasma pth levels fluctuated slightly during the day, by about 20 pg/ml, but there was a distinct peak (42.8 [8.8] pg/ml) at 07.00. Plasma Ca(2+) showed a diurnal pattern in which two peaks (increases of 0.03 mmol/l) were observed at 05.00 and 17.00, and the plasma concentration of inorganic phosphorus showed a similar pattern. There were no diurnal changes in total calcium or albumin.
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