Abstract TP151: 30-Minute ABPM Underdetects White Coat Hypertension Despite Good Diagnostic Accuracy

Introduction: Hypertension is the leading modifiable stroke risk factor, yet 24-hour ambulatory blood pressure monitoring (ABPM) access is limited by patient burden and capacity constraints. Shorter 30-minute protocols may expand population-based stroke screening but could misclassify white coat hypertension (WCH), causing unnecessary treatment and inefficient resource allocation. Aims: To compare 30-minute versus 24-hour ABPM for diagnosing hypertension and detecting WCH, and evaluate a tiered approach for stroke prevention in resource-limited settings. Methods: Cross-sectional study of 90 Vietnamese adults from routine care (median age 34 years [IQR 25-55]; 60% male) completing both protocols. Office hypertension was ≥140/90 mmHg. Normal ambulatory BP was