It can vary quite a bit. I generally suffer with low blood pressure and I'm told I need to keep my fluids up if I feel it's dropping (not alcohol or caffeine though, mores the pity)
I had to go for a procedure recently and I was very nervous. It was the highest I'd ever seen it. After the procedure it started dropping straight away.
My GP still uses one of the old-fashioned sphygmamometers even though she has to hide it when the inspectors come round as mercury is not allowed in the surgery even though it's in a sealed glass tube. She insists that it gives a much more accurate reading than the electric ones.
jackdaw is right abou the normal bp
BUT in the old and most ABer are sagging at the edges - the normal systolic ( big no) is 100+age
( so my normal is 170)
diastolic ( lower number shouldnt be above 90 and at 100 is EEK!)
Got me thinking here...….so I did mine. I "promised" to do it regularly aggggeeess ago and keep forgetting. 120 over 60. After a very busy day and a glass of Shiraz. Heart rate 54. Age 70. Will take that.