May 26, 2021 WEDNESDAY, May 26, 2021 (HealthDay News) — For patients with adrenal incidentalomas, autonomous cortisol secretion is associated with mortality at a plasma cortisol level after a 1-mg dexamethasone suppression test (cortisol DST) of 83 nmol/L or higher, according to a study published online May 25 in the Annals of Internal Medicine. Albin Kjellbom, M.D., from Skåne University Hospital in Lund, Sweden, and colleagues measured the association between mortality and levels of autonomous cortisol secretion in a retrospective cohort study involving patients with adrenal incidentalomas from two hospitals in southern Sweden. Patients were grouped according to cortisol DST and were followed for up to 14 years.