Q: I take my blood pressure reading every morning and it’s always normal; however, when I get home in the evening, the reading can be around 160/90. WHEN is the best time to take an accurate reading of blood pressure? I am not on any medication for anything.
A: Blood pressure varies throughout the day. Blood pressure does not stay at a constant number. It changes with activity and stress. However, blood pressure should remain within the normal range. You need to let your doctor know your pressure is consistently high in the evening. To get a good picture of what is happening with your blood pressure; several readings taken at the same time of day at different times will give the best information.
Get the most out of home blood pressure monitoring – WebMD.com