Hi Carolyn Boynton:
The Joint National Committee defines four blood pressure categories.Very High Range - Stage 2 HypertensionSystolic (top) blood pressure 160 mm Hg or highDiastolic (bottom) blood pressure 100 mm Hg or higherIf in this range you have hypertension (high blood pressure).High Range - Stage 1 HypertensionSystolic (top) blood pressure 140 - 159 mm HgDiastolic (bottom) blood pressure 90 - 99 mm HgIf in this range you have hypertension (high blood pressure).Caution Range - PrehypertensionSystolic (top) blood pressure 120 - 139 mm HgDiastolic (bottom) blood pressure 80 - 89 mm HgTake action!Normal Range - NormalSystolic (top) blood pressure below 120 mm HgDiastolic (bottom) blood pressure below 80 mm HgPerfect!
Your one blood pressure reading looks fairly good. The top (systolic) number does fall in the prehypertension range. Doctors prefer for blood pressure to be monitored over a fair amount of time to see if you always run in the prehypertension range or above or below. It is natural for your bodies blood pressure to vary throughout the day. I've attached the following link with more information on blood pressure's:
Hypertension: Patient Guide