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Table 2 Comparison of serum and ionized calcium, parathyroid hormone, and 1,25-dihydroxycholecalciferol levels

From: A genetic variant of CYP2R1 identified in a cat with type 1B vitamin D-dependent rickets: a case report

   Affected cat Healthy cat
Reference range 6-month-old, intact female 6-month-old, intact male 9-month-old, spayed female
Serum calcium (mmol/L) 2.05–3.02 1.62 2.52 2.40 2.34
Ionized calcium (mmol/L) 1.20–1.35 0.74 1.31 1.26 1.29
Parathyroid hormone (pg/mL) 8.0–25.0 99.7 8.7 9.9 9.2
25-hydroxycholecalciferol (nmol/L) 12 133 148 126
1,25-dihydroxycholecalciferol (pg/mL) 23.1 232 251 227