Cortisol Testing Kit Market: Is the "Diurnal Rhythm" Test the New Gold Standard for Sleep Health? In 2026, sleep specialists are increasingly ditching single-point blood draws in favor of multi-sample "diurnal rhythm" kits. Because cortisol naturally peaks in the morning and drops at night, a single test often fails to capture the full picture of a patient's adrenal health. In 2026, the market has responded with comprehensive home kits from companies like RxHomeTest and HRT.org that require...
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