Table 6.

Parathyroid hormone (PTH), vitamin D metabolite and calcitonin results in hypercalcaemic male (case 2) and female (case 3) 5-month-old British Shorthair cats

	Case 2	Case 3	RI
PTH (pmol/l)	<0.2	<0.2	0.3–4.0*
1,25 Dihydroxyvitamin D (calcitriol; pmol/l)	436.4	406.3	192–317†
25-Hydroxyvitamin D (calcidiol; nmol/l)	553.4	242.5	126–163†
Calcitonin (ng/l)	<0.9	<0.9	<0.9–3.2‡
Ionised calcium (mmol/l)	1.94	1.91	1.10–1.40

^*Reference interval (RI) taken from Pineda et al⁷

^†RI taken from Tomsa et al,⁶ which was derived in healthy age-matched control cats

^‡RI taken from Pineda et al⁸