Everyone gets a liverdump in the morning. I know if I skip breakfast and have a shower and walk to my GP's, (like today), I shouldn't be surprised to see my FBS go up well past what I'd normally get if I'd eat a bit of cake. I mean, I could hit a 7, maybe even 8. Because my liver's dumping glucose to help out, give me energy, as I'm being active and have taken no food. I assume the test with your dad's meter was done in situ? And the other test was possibly after being relatively active and getting to the doc's office? In any case, if you want to have a look at your FBS, have the meter on your nightstand and test before you get up out of bed. "Feet on the ground" can make bloodsugars rise as it'll cue your liver. Basically... A FBS doesn't say all that much at this time.