Can anyone please explain why there is a difference in BG reading when the test is done consecutively from each hand? My Hubby took his morning reading from a finger on his left hand. For some reason(purely curiosity I suspect) he took it again from the same finger but on his right hand. The readings were different by 1 .0 . (eg; 7.2 left hand ,8.2 right hand). Which one is the "true" reading? The only thing I can think of that would cause a difference is one sample was from oxygenated blood and the other from de-oxygenated blood, which I know may sound stupid.