AAP 2017. Flynn et al.

Pediatric BP Percentile + Hypertension Staging

Classify blood pressure as normal, elevated, Stage 1, or Stage 2 hypertension using AAP 2017 normative tables (ages 1–17).

Height-50th percentile model: This calculator uses the 50th height percentile column from AAP 2017 Tables 6 & 7. Thresholds for other height percentiles (5th–95th) differ slightly. If your patient is significantly above or below average height for their age, refer to the full published tables for the most accurate classification. Full AAP 2017 guideline →

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Frequently Asked Questions About Pediatric Hypertension

The AAP 2017 guideline defines four BP categories for children 1–17 years:

  • Normal: SBP and DBP <90th percentile
  • Elevated BP: SBP or DBP ≥90th but <95th percentile, OR SBP ≥120/<80 mmHg in adolescents (regardless of percentile)
  • Stage 1 Hypertension: SBP or DBP ≥95th percentile to <95th+12 mmHg
  • Stage 2 Hypertension: SBP or DBP ≥95th+12 mmHg OR SBP ≥140 mmHg OR DBP ≥90 mmHg in adolescents

Classification is based on the higher of the two values (SBP or DBP).

Normal BP increases with both age and height in children. Taller children normally have higher blood pressures than shorter children of the same age. The AAP 2017 tables provide BP percentiles at 7 height percentiles (5th, 10th, 25th, 50th, 75th, 90th, 95th) for each age and sex.

This calculator uses the 50th height percentile thresholds. A child at the 95th height percentile will have slightly higher normal thresholds; a child at the 5th height percentile will have slightly lower thresholds. For the most accurate classification, use the full published tables when height is significantly above or below average.

Hypertension in children requires elevated BP on 3 or more separate occasions before diagnosis. A single elevated reading triggers repeat measurement and follow-up, not immediate diagnosis. The AAP 2017 guideline recommends:

  • Elevated BP (90th–95th %ile): Re-measure at next 1–2 visits
  • Stage 1 HTN confirmed: Evaluate within 1–4 weeks; consider referral
  • Stage 2 HTN: Prompt evaluation and treatment; refer within 1 week (or sooner if symptomatic)

Accurate measurement requires: (1) proper cuff size. Bladder length should be 80–100% of arm circumference, bladder width 40%; (2) child seated quietly for 5 minutes; (3) right arm at heart level; (4) auscultatory technique preferred for diagnosis. Oscillometric devices are acceptable for screening but elevated values must be confirmed by auscultation. Average of 2–3 readings on the same arm.

Secondary hypertension is more common in children than adults. Evaluate for secondary causes when: BP is Stage 2, child is <6 years, there is no family history of essential HTN, body weight does not explain the elevation, or there are signs/symptoms suggesting secondary cause (hematuria, proteinuria, abdominal bruit, virilization, moon facies).

Common secondary causes: renal parenchymal disease (most common), renovascular disease, coarctation of the aorta, endocrine causes (hyperthyroidism, Cushing syndrome, primary aldosteronism).