Introduction: Adrenal insufficiency (AI) is a life-threatening condition that frequently presents with non-specific symptoms, complicating early diagnosis. Morning serum cortisol serves as an effective initial screening tool for assessing the hypothalamic-pituitary-adrenal (HPA) axis, potentially reducing the necessity for dynamic investigations such as the Short Synacthen Test (SST). This study aims to assess the clinical indications for morning cortisol testing and evaluate institutional compliance with guideline-based cortisol cut-offs, the initiation of hydrocortisone therapy, and the provision of “sick day” education. Methodology: A retrospective cross-sectional study was conducted among inpatients at a tertiary hospital in Central Pahang who underwent morning cortisol evaluation between March and August 2025. Data regarding demographics, indications, biochemical results, and clinical management were analyzed using SPSS version 26.0. Results: Among the 111 patients included (mean age: 54.96 ± 15.88 years), the primary indications for testing were hyponatremia (54.1%), hypotension (27.9%), and a history of traditional medication use (26.1%). Based on Endocrine Society guidelines: <150 nmol/L (AI likely): 16.2%, 150–300 nmol/L (Borderline): 26.1%, and >300 nmol/L (AI unlikely): 57.7%. Notably, only 10 of the 18 patients with cortisol levels <150 nmol/L were formally diagnosed and initiated on appropriate therapy. In the borderline group, only two patients underwent an SST. Although 12 patients overall were treated for AI, only eight received documented “sick day” education. Low cortisol levels were significantly associated with hyponatremia, hypotension, and traditional medication use, and demonstrated a negative correlation with serum sodium and albumin levels. Conclusion Morning serum cortisol is a valuable screening tool for AI, particularly in patients presenting with hyponatremia or hypotension. However, significant gaps persist in follow-up management, confirmatory testing, and patient education. Implementing standardized protocols and enhancing clinician education are essential to optimize care.
Hydrocortisone ; Adrenal Insufficiency ; Tertiary Care Centers