See answer, probably: There is no hard and fast rule. In the office I take at least 2 readings 20 minutes apart if the first is elevated. The second is often lower. For home measurement the 3 readings 1 minute apart are supposed to be averaged to correct for any inaccuracy of a single reading. But I think it's reasonable to take the 3rd reading as a truer reflection of your BP.
Answered 9/10/2016
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