Table 2.

Positive and negative predictive values of various basal cortisol concentrations for the diagnosis of hypoadrenocorticism in dogs

Basal Cortisol (nmol/L)	Positive Predictive Value (%)			Negative Predictive Value (%)
	3% Prevalence	15% Prevalence	21% Prevalence	3% Prevalence	15% Prevalence	21% Prevalence
≤5.5	73.7	94.1	96.0	99.4	96.8	95.3
≤22	41.1	79.9	85.7	99.9	99.4	99.1
≤55	8.5	34.7	44.5	100	99.8	99.8

The positive and negative predictive values for 3 basal serum or plasma cortisol concentration cut‐points are presented. The predictive values were calculated based on the MSU‐VMC prevalence of 21% as well as 2 previously reported prevalence rates.10, 11