Agreement of Immunoassay and Tandem Mass Spectrometry in the Analysis of Cortisol and Free T4: Interpretation and Implications for Clinicians
Figure 2
Bland-Altman plots of FT4 (ng/dl), first trimester (T1, 2A), second trimester (T2, 2B), 3rd trimester (T3, 2C), and in nonpregnant (NP, 2D) women. Difference (MSMS-IA) on Y axis and average value from IA and MSMS on X axis. (Pregnant cohort N with both ranges from 59 (T1) to 26 (T3); nonpregnant cohort N is 28.) Reference line at zero and pairs of lines at 1SD and 2SD.
