- Enter the child's age (1–17 years) and select sex.
- Enter the measured systolic and diastolic blood pressure (mm Hg), taken with a correctly sized cuff after the child has been seated and at rest.
- The tool classifies the reading as Normal, Elevated BP, Stage 1, or Stage 2 hypertension per the 2017 AAP guideline and updates automatically.
- For ages ≥13 the adult-aligned mm Hg thresholds are applied (120/80, 130/80, 140/90). For ages 1–12 the tool uses the AAP simplified screening thresholds (see the disclosure note below); the exact diagnosis depends on the child's height percentile, so confirm borderline values against the full sex/age/height AAP tables.
A single elevated reading is a screening result, not a diagnosis — confirm over ≥3 separate visits before labelling a child hypertensive. All computation runs in your browser; no values are stored or transmitted.
When to Use
Use this tool to screen and stage office blood pressure in children and adolescents 1–17 years old against the 2017 AAP Clinical Practice Guideline. BP should be measured at every health-maintenance visit from age 3, and at every encounter in children with obesity, renal disease, diabetes, aortic-arch obstruction/coarctation repair, or who take medications known to raise BP. The reading is a starting point — an elevated value triggers a defined schedule of repeat measurement and, if persistent, formal diagnosis.
Appropriate population
Children and adolescents aged 1–17 with an auscultatory or validated-oscillometric office BP. For ages ≥13 the simplified adult-aligned thresholds apply directly. For ages 1–12 the diagnosis is percentile-based (sex, age, and height), so the result here is a screening classification to be confirmed against the full AAP normative tables.
When NOT to rely on it alone
One reading does not diagnose hypertension. An elevated office BP must be confirmed on ≥3 separate visits (the AAP suggests repeating at the same visit and at follow-up), and ambulatory BP monitoring (ABPM) is recommended to confirm the diagnosis and exclude white-coat hypertension. Neonates and infants <1 year, and oscillometric readings in a crying or moving child, fall outside this tool. The under-13 classification is height-dependent — always reconcile borderline values with the full sex/age/height table.
Pearls & Pitfalls
Confirm before you label
A single high reading is never diagnostic. The AAP defines hypertension as a BP at or above the threshold on three or more separate occasions. Auscultation is preferred for confirmation; an elevated oscillometric reading should be repeated by manual auscultation. Confirm sustained elevation with ambulatory BP monitoring (ABPM) where available.
Think secondary causes — especially in young, severe cases
The younger the child and the higher the stage, the more likely the hypertension is secondary. Renal parenchymal disease and renovascular disease are the commonest causes in children; also screen for coarctation of the aorta (check four-limb BP and femoral pulses) and endocrine causes. This is the central reason pediatric hypertension belongs in a nephrology referral pathway — pursue a cause rather than reflexively treating the number.
Technique pitfalls
(1) Cuff size matters enormously — a too-small cuff overestimates BP. The bladder width should be ≈40% of the mid-arm circumference and the bladder should encircle 80–100% of the arm. (2) The child should be seated, back supported, feet on the floor, arm at heart level, after ≥3–5 minutes of rest. (3) The under-13 thresholds in this tool are the AAP simplified screening values (built at a lower height percentile to maximize sensitivity); a child at a higher height percentile may be normal at a value flagged here — verify against the full table. (4) Do not apply adult thresholds to a child <13.
Why Use It
Childhood blood pressure tracks into adulthood and is increasingly common with rising rates of pediatric obesity, yet it is frequently under-recognized because the normal range depends on age, sex, and height rather than a single fixed number. The 2017 AAP guideline reset the normative tables (excluding overweight/obese children so body habitus would not bias the reference) and added simplified screening thresholds so any clinician can flag a child who needs further evaluation. Identifying elevated BP early matters: in children it is disproportionately secondary — often renal or renovascular — and detecting it opens the door to finding and treating a curable cause and to preventing early target-organ damage (left-ventricular hypertrophy, vascular and renal injury).
Pediatric Blood Pressure — AAP 2017 Classification
Enter age, sex, and the measured systolic and diastolic blood pressure. The tool returns the AAP 2017 category — Normal, Elevated BP, Stage 1, or Stage 2 hypertension. For ages ≥13 the adult-aligned thresholds are exact; for ages 1–12 it applies the AAP simplified screening thresholds (see disclosure below).
⚕ Classification per Flynn JT, et al. Pediatrics. 2017;140(3):e20171904. For ages ≥13 the adult-aligned thresholds (120/80, 130/80, 140/90) are exact. For ages 1–12 this tool applies the AAP simplified screening thresholds, which are built at a lower height percentile to maximize sensitivity; the definitive diagnosis depends on the child's sex-, age-, and height-percentile-specific values in the full AAP normative tables. Verify borderline results with the full tables or an official calculator (e.g. the MDCalc AAP Pediatric Hypertension calculator). A single reading is not diagnostic — confirm over ≥3 visits. For licensed clinicians; not a substitute for individualized assessment.
Next Steps
Use the category to drive the AAP follow-up pathway — and always confirm before diagnosing.
- Normal: continue routine screening at health-maintenance visits (annually from age 3, or at every visit if obese, renal/diabetic, or on BP-raising drugs).
- Elevated BP: provide lifestyle counselling (weight, diet, activity, sleep) and recheck in 6 months. If still elevated, repeat with upper- and lower-extremity BP and recheck in another 6 months; persistent elevation warrants evaluation.
- Stage 1 HTN (asymptomatic): recheck and confirm at 1–2 weeks; if still Stage 1, repeat in ~3 months and, if persistent, proceed to diagnostic evaluation (including ABPM) and management.
- Stage 2 HTN: confirm and evaluate within 1 week (or immediately/refer if symptomatic or markedly elevated); urgent referral to a pediatric hypertension specialist / nephrologist.
- Confirm sustained elevation with ambulatory BP monitoring (ABPM); screen for secondary causes (renal/renovascular, coarctation, endocrine) — the workup is more aggressive the younger the child and the higher the stage.
- Pair with the Revised Schwartz eGFR to assess renal function in the workup.
Evidence & References
AAP 2017 classification
| Category | Ages 1 to <13 y | Ages ≥13 y |
|---|---|---|
| Normal | < 90th percentile | < 120/80 mm Hg |
| Elevated BP | ≥ 90th to < 95th percentile, or 120/80 to < 95th percentile (whichever is lower) | 120/<80 to 129/<80 mm Hg |
| Stage 1 HTN | ≥ 95th percentile to < (95th + 12 mm Hg), or 130/80 to 139/89 (whichever is lower) | 130/80 to 139/89 mm Hg |
| Stage 2 HTN | ≥ (95th percentile + 12 mm Hg), or ≥ 140/90 (whichever is lower) | ≥ 140/90 mm Hg |
Method & data sources used
For ages ≥13 this tool applies the AAP 2017 simplified adult-aligned mm Hg thresholds exactly. For ages 1–12 it uses the AAP 2017 simplified screening BP table — sex- and age-specific systolic/diastolic values defined at the 90th percentile (the lower height range, chosen for sensitivity) that should prompt further evaluation; a value below the screening threshold is classified Normal, and Stage cutoffs are estimated from the screening value because the precise 95th-percentile and 95th + 12 mm Hg boundaries are height-percentile-dependent.
Stated approximation
The full AAP normative percentiles for ages 1–12 require the published sex/age/height regression tables. Those height-specific coefficient tables could not be independently verified for this build, so to avoid fabricating values the under-13 logic uses the AAP simplified screening thresholds as the Normal/Elevated boundary and approximates the Stage boundaries from them. Treat the under-13 output as a screening classification and confirm against the full AAP tables or an authoritative calculator (e.g. MDCalc). The ≥13-year classification is exact.
References
- Flynn JT, Kaelber DC, Baker-Smith CM, et al. Clinical Practice Guideline for Screening and Management of High Blood Pressure in Children and Adolescents. Pediatrics. 2017;140(3):e20171904. doi:10.1542/peds.2017-1904.
- National High Blood Pressure Education Program Working Group on High Blood Pressure in Children and Adolescents. The Fourth Report on the Diagnosis, Evaluation, and Treatment of High Blood Pressure in Children and Adolescents. Pediatrics. 2004;114(2 Suppl):555–576.
- Flynn JT, et al. Simplified screening blood pressure values requiring further evaluation (Table 4, derived from the 2017 AAP normative percentile tables). In: Pediatrics. 2017;140(3):e20171904.
