Routine cortisol measurement was done using the conventional cortisol assay (Roche Elecsys® cortisol II assay, Roche Diagnosis). This widely used assay uses electrochemiluminescence immunoassay (ECLIA), which uses monoclonal assay to measure serum cortisol levels. This method can be traced to a gas chromatography-mass spectrometry/mass spectrometry (GC–MS/MS) reference40 (link),41 (link). Serum cortisol levels ranging between 7.07 and 19.6 μg/dL can be reliably measured using this assay42 .
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