title: Results of the 8 a.m. dexamethasone suppression test constitute a suitable tool for confirming the diagnosis of melancholia. A test unaffected by the variations in the bioavailability of dexamethasone.
abstract: This prospective study was conducted in order (1) to examine which postdexamethasone cortisol value i.e., 8 a.m., 4 p.m. or peak cortisol - is most suitable as a laboratory test to help confirm the diagnosis of melancholia and (2) to investigate the influence of the dexamethasone levels in the results of the dexamethasone suppression test (DST). To this end we administered the DST to 48 controls and 115 depressed inpatients categorized according to DSM-III. The 8 a.m. and 4 p.m. dexamethasone levels were determined in 100 subjects. We found that an 8 a.m. postdexamethasone cortisol value greater than or equal to 3.5 micrograms/dl was of the most significant diagnostic value in order to separate melancholia from normal controls and/or minor depressives. The 8 a.m. and 4 p.m. dexamethasone values did not differ between healthy controls, minor and severely depressed patients. Although cortisol nonsuppressors exhibited significantly lower dexamethasone values, the predictive value of the DST for melancholia was not affected by the large variation in the bioavailability of dexamethasone.
authors.affiliation: Department of Psychiatry, University Hospital of Antwerp, Belgium.
authors.forename: M
authors.initials: M
authors.lastname: Maes
authors.forename: M
authors.initials: M
authors.lastname: Vandewoude
authors.forename: C
authors.initials: C
authors.lastname: Schotte
authors.forename: P
authors.initials: P
authors.lastname: Cosyns
mesh_terms: D000328:Adult; D000341:Affective Disorders, Psychotic / Q000175:diagnosis; D000367:Age Factors; D002940:Circadian Rhythm / Q000502:physiology*; D003866:Depressive Disorder / Q000097:blood / Q000175:diagnosis* / Q000523:psychology; D003907:Dexamethasone; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000097:blood*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011569:Psychiatric Status Rating Scales; D012737:Sex Factors
chemical_list: D003907:Dexamethasone; D006854:Hydrocortisone