Cortisol levels of 21 hospitalized prepubertal depressed children given
the dexamethasone suppression test (DST) were measured by radioimmunoassay
and by fluorescent polarization immunoassay, a new assay method.
Correlation analyses demonstrated a highly significant linear relationship
between the two methods of measuring cortisol. Thus, it may be possible to
use fluorescent polarization immunoassay to measure cortisol levels in
children undergoing the DST.