Hypercortisolism Screening Pearls and Pitfalls

This episode, titled ‘Hypercortisolism Screening Pearls and Pitfalls,’ features panelists, expert primary care physicians, discussing common factors that can influence the accuracy of hypercortisolism screening and how clinicians can avoid misleading test results. Building on previous discussions of the dexamethasone suppression test, the panel reviews patient characteristics, medications, and clinical conditions that should be considered before initiating screening to improve diagnostic confidence.

The panel explains how conditions such as severe obstructive sleep apnea, excessive alcohol use, liver disease, end-stage renal disease, and night-shift work can contribute to false-positive or otherwise difficult-to-interpret results. They also discuss the importance of reviewing medication histories, highlighting the effects of estrogen-containing therapies, certain antiseizure medications that alter dexamethasone metabolism, and recent exposure to exogenous corticosteroids. Throughout the conversation, expert faculty emphasize that a careful review of these factors can help clinicians determine whether testing should be delayed or interpreted with additional caution.

The discussion also compares practical considerations for available screening approaches, including situations in which late-night salivary cortisol or 24-hour urinary free cortisol testing may be less reliable. The panel reinforces that selecting the most appropriate screening strategy requires consideration of the individual patient's clinical circumstances rather than relying on a single testing approach for every patient. By understanding common confounders before ordering laboratory testing, primary care clinicians can reduce unnecessary repeat evaluations, improve diagnostic accuracy, and more confidently identify patients who warrant further endocrine assessment for suspected hypercortisolism.

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