Diurnal variations in the plasma concentration of parathyroid hormone in dogs.
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.
López
I
I
Departamento Medicina y Cirugía Animal, Universidad de Córdoba, Campus Rabanales, Ctra Madrid-Cádiz km 396, 14014 Córdoba, Spain.
Aguilera-Tejero
E
E
Estepa
J C
JC
Bas
S
S
Mayer-Valor
R
R
Jiménez
A
A
Rodríguez
M
M
D000818:Animals; D001774:Blood Chemical Analysis / Q000662:veterinary; D002118:Calcium / Q000097:blood; D002940:Circadian Rhythm; D004285:Dogs / Q000097:blood*; D005260:Female; D006863:Hydrogen-Ion Concentration; D008297:Male; D010281:Parathyroid Hormone / Q000097:blood*; D010758:Phosphorus / Q000097:blood; D012709:Serum Albumin / Q000032:analysis
D010281:Parathyroid Hormone; D012709:Serum Albumin; D010758:Phosphorus; D002118:Calcium