@celia16 The best advice I have seen is to take three separate measurements several minutes apart. Note that if you have serious obligations, are in pain, have a meeting looming, worries, are fidgety or irritated, or on certain meds, these can all raise your blood pressure. To get a proper baseline, you could take these three measurements early in the day, prior to tea and coffee since caffeine affects blood pressure and heart rate. Then, you can take the lowest of the three measurements as a possible indicator of a true baseline, but one should average all three measurements and take that average number as a reference point for the rest of THAT DAY. Note, also, that day-to-day averaged assessments will vary as well, often by several points in both systolic and diastolic numbers. Keeping a record of a weekly or monthly series of assessments, and averaging those, will give you a pretty accurate indication of where your true baseline, your daily operating baseline, really is.

@celia16 Great idea. Thanks!