RT Book, Section A1 Hart, Peter D. A1 Bakris, George L. A2 Lerma, Edgar V. A2 Berns, Jeffrey S. A2 Nissenson, Allen R. SR Print(0) ID 6338323 T1 Chapter 41. Primary (Essential) Hypertension T2 CURRENT Diagnosis & Treatment: Nephrology & Hypertension YR 2009 FD 2009 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-144787-4 LK accessmedicine.mhmedical.com/content.aspx?aid=6338323 RD 2024/04/23 AB Primary hypertension in adults aged 18 years and older is defined as blood pressure of 140/90 mm Hg or more, based on an average of two or more properly measured seated blood pressure (BP) readings at each of two or more clinic visits.Normal BP is a systolic BP (SBP) <120 mm Hg and diastolic BP (DBP) <80 mm Hg.Prehypertension is defined as an SBP of 120–139 mm Hg or DBP of 80–89 mm Hg.Stage 1 hypertension is defined by an elevation in either SBP 140–159 mm Hg or diastolic BP of 90–99 mm Hg.Stage 2 hypertension is defined by an elevation in either SBP of ≥160 mm Hg or DBP of ≥100 mm Hg.The level of BP alone is inadequate for diagnosis and it should be interpreted in the context of the overall cardiovascular risk of the patient, which is most easily estimated by evaluating other concomitant disorders and target-organ damage (TOD).