A Simple Ultraperformance Liquid Chromatography-Tandem Mass Spectrometry Method for Measurement of Cortisol Level in Human Saliva

Figure 4

Multiple reaction monitoring chromatograms of four quality control samples ((a) 0.5, (b) 1.5, (c) 50, and (d) 90 ng/ml) spiked with 20 ng/ml internal standard (IS).

(a)

(b)

(c)

(d)