JNC-7 recommends 2 or more properly measured, seated blood pressure readings on each of 2 or more office visits to establish the diagnosis of<unk> 
JNC-8 Changes:
In patients ≥60 yr the threshold has increased from <140/90 to <150/90
Patients with diabetes mellitus (any age) and >140/90
In patients ≥60 yr the threshold has increased from <140/90 to <150/90
Patients with diabetes mellitus (any age) and >140/90
Asymptomatic<unk> Systolic BP 140-179 or diastolic BP 90-109
Asymptomatic
Hypertensive urgency^
Systolic BP ≥ 180 or diastolic BP ≥ 110
No evidence of end-organ dysfunction
Hypertensive emergency
Systolic BP ≥ 180 or diastolic BP ≥ 110
Evidence of end-organ dysfunction
Systolic BP 140-179 or diastolic BP 90-109
Asymptomatic
Systolic BP ≥ 180 or diastolic BP ≥ 110
No evidence of end-organ dysfunction
Systolic BP ≥ 180 or diastolic BP ≥ 110
Evidence of end-organ dysfunction
^Many emergency physicians do not use the diagnosis of "hypertensive urgency," but utilize instead only hypertensive emergency (signs of end organ dysfunction) or asymptomatic<unk> (all others)
Hypertension 
Hypertensive emergency
Diabetes mellitus 
Stroke
Pregnancy 
Sympathetic crashing acute pulmonary edema
Asymptomatic hypertension
Ischemic stroke