REN and primary aldosteronism: <h4>Objective</h4>To evaluate the screening value of 24-hour urinary aldosterone (24h-Uald) and the urinary aldosterone-to-renin ratio (UARR) for primary aldosteronism (PA in hypertensive patients under conditions of ongoing antihypertensive medication use.<h4>Methods</h4>Hypertensive patients who underwent PA screening at our hospital between August 2024 and August 2025 were retrospectively enrolled.