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Reportable range study, with simple linear regression for within-run spiking-recovery canine urine cortisol. The simple linear regression slope = 1.025 (close to 1), intercept = 0.706 (close to 0). The coefficient of determination R2 of 0.998 (close to 1); >0.975 indicates that the assessed range is sufficient. 1 Linearity was confirmed between 0.25 and 50 μg/dL.
