- If a BP measurement prior to registration is > 95th percentile for age and height, it must be rechecked and documented to be < 95th percentile for age and height prior to registration; if a patient falls between the height or weight percentiles, site should average the value as appropriate; for patients ≥ 18 years the normal blood pressure should be < 140/90 mm of Hg; patients with hypertension are eligible if their blood pressures become < 95th percentile for age and height after anti-hypertensive medications