Agreement of Immunoassay and Tandem Mass Spectrometry in the Analysis of Cortisol and Free T4: Interpretation and Implications for Clinicians

Figure 1

Bland-Altman plot of Cortisol ((mcg/dl) at 𝑇=0 (a), 𝑇=30 (b), and 𝑇=60 (c) minutes) in the cortisol response test: difference MSMS-IA on 𝑌 axis and average on 𝑋 axis. 𝑁=80. Reference line at zero and pairs of lines at ±1SD and ±2SD.

(a)

(b)

(c)