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Reportable range study, with simple linear regression for within-run spiking-recovery canine serum cortisol. The simple linear regression yields a slope of 0.953 (close to 1), an intercept of 0.538 (close to 0). The coefficient of determination R2 of 0.997 (close to 1) shows that the assessed range is sufficient.1 Linearity was confirmed between 0.25 and 50 μg/dL.
