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The new guideline thresholds for persons aged 18–19 years align with recommendations in the 2017 Hypertension Clinical Practice Guideline for persons aged ≥18 years.** For persons aged 18–19 years, elevated BP was defined as SBP ≥120 mmHg to <130 mmHg and DBP <80 mmHg hypertension was defined as BP ≥130/80 mmHg or antihypertensive medication use. To apply the new guideline, among adolescents aged 12–17 years, elevated BP was defined as BP ≥90th to <95th percentile or SBP ≥120 mmHg to <95th percentile hypertension was defined as BP ≥95th percentile, BP ≥130/80 mmHg, or reported antihypertensive medication use. The new guideline used new percentile tables (from a reference population excluding youths with overweight/obesity). Among persons aged 18–19 years, elevated BP was defined as SBP ≥120 mmHg to <140 mmHg or DBP ≥80 mmHg to <90 mmHg hypertension was defined as BP ≥140/90 mmHg or reported antihypertensive medication use. During this time, prevalence of hypertension declined, using both the new (from 7.7% to 4.2%, p15 years ¶) (Supplementary Table 1, ). To examine trends in youth hypertension and the impact of the new guideline on classification of hypertension status, CDC analyzed data from 12,004 participants aged 12–19 years in the 2001–2016 National Health and Nutrition Examination Survey (NHANES). Hypertension is an important modifiable risk factor for cardiovascular morbidity and mortality, and hypertension in adolescents and young adults is associated with long-term negative health effects ( 1, 2).* In 2017, the American Academy of Pediatrics (AAP) released a new Clinical Practice Guideline ( 3), which updated 2004 pediatric hypertension guidance † with new thresholds and percentile references calculated from a healthy-weight population.