Fig. 8From: Laser desorption/ionization mass spectrometry of L-thyroxine (T4) using combi-matrix of α-cyano-4-hydroxycinnamic acid (CHCA) and grapheneStatistical analysis between the conventional immunoassay and MALDI-TOF MS based on the combi-matrix for the quantitative analysis of T4. a The Bland–Altman test. b The Passing–Bablok regressionBack to article page