Yes it does make a difference.
Nurse at hospital made certain to tell me that BS blood should be taken from the side of the finger and that the finger/hands should be cleaned first as there will be residue from daily activity and possibly even sweat which can lead to a false reading.
understand that "normal" high blood sugar ranges between
135 to 140 milligrams per deciliter.
BS tested before breakfast (after a night without food) normally ranges between 70 to 100 milligrams.
IF you go without eating for 8-12 hours expect a lower blood sugar count.
Ideally we are supposed to test AFTER two hours have passed since the last time we eat anything, or anything with nutritional water - that means anything other than water or diet coke(s) type of thing. Anything that has a calorie will upset the blood test.
So have you been drinking stuff other than water? If so it can raise the blood sugar level.
As for testing, side of the finger (not the pad) and after you wash your hands with soap and warm water OR use an alcohol swap to really clean off any residue from anything.
Unless you have one of those testers designed for taking blood from the arm. Then follow the directions on that.
While your Blood Sugar is high, it falls with in nominal parameters.
However if in doubt do see your doctor.