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Diagnosis of adrenal insufficiency (AI) in infants can be difficult. While a low random cortisol can signal AI, often confirmatory tests are required when clinical suspicion is strong but the cortisol levels are equivocal. Several studies have demonstrated that in sick preterm infants, there is relative adrenal insufficiency (RAI) defined as an inadequate cortisol production relative to the degree of stress or illness, a condition which can last for several weeks, while in term infants the adrenal axis is mature at birth (Bagnoli F, Mori A, Fommei C, Coriolani G, Badii S, et al. ACTH and cortisol cord plasma concentrations in preterm and term infants. J Perinatol 2013;33:520–4). Adrenocorticotrophic hormone (ACTH) and corticotrophin releasing hormone (CRH) stimulation tests have been validated in infants in several studies. In light of recent reports of false-negative results of stimulation tests, it is imperative to highlight the pitfalls of these tests. The purpose of this communication is to bring attention to the accuracy of timing of these tests in infants.

Clinical utility of stimulation tests in infants with suspected adrenal insufficiency (AI)