Fig. 2
From: Prevalence and risk factors for hyperthyroidism in Irish cats from the greater Dublin area
Serum total thyroxine (T4) concentration in 40 and 60 hyperthyroid cats with or without goitre. The reference interval for total T4 (15–60 nmol/L) is indicated by the shaded area. Values above 193.0 and below 6.4 nmol/L are all assigned as those values, respectively