Serum concentrations of ionized calcium, vitamin D3, and parathyroid hormone in captive thick-billed parrots (Rhynchopsitta pachyrhyncha)

Lauren L. Howard, Philip H Kass, Nadine Lamberski, Ray F. Wack

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14 Scopus citations


Serum collected from 68 thick-billed parrots (Rhynchopsitta pachyrhyncha) from 15 institutions was analyzed for ionized Ca (iCa), total Ca (tCa), P, total protein (TP), albumin (Alb), parathyroid hormone (PTH), and vitamin D 3. Values were not distributed normally; 95% frequency intervals were as follows: iCa (0.82-1.3 mmol/L), tCa (1.37-2.09 mmol/L,), P (0.35-1.75 mmol/L), TP (21-39 g/L), Alb (9-13 g/L), PTH (0-65.68 pmol/L), and vitamin D, (5.2-51 nmol/L). Sixty percent (±7.5%) of tCa was ionized. Female thick-billed parrots had significantly higher mean iCa (1.11 mmol/L, n = 22) than male thick-billed parrots (1.05 mmol/L, n = 32). tCa and iCa values in thick-billed parrots were lower than the reported values for other psittacine species. A significant positive linear relationship existed between Alb-TP and iCa-tCa ratios. A significant inverse linear relationship was also identified between the tCa-P ratio and PTH. These findings are consistent with known domestic avian Ca physiology.

Original languageEnglish (US)
Pages (from-to)147-153
Number of pages7
JournalJournal of Zoo and Wildlife Medicine
Issue number2
StatePublished - Jun 2004


  • Ionized calcium
  • Parathyroid hormone
  • Rhynchopsitta pachyrhyncha
  • Thick-billed parrot
  • Vitamin D

ASJC Scopus subject areas

  • Environmental Science(all)
  • Animal Science and Zoology
  • veterinary(all)


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