As for the inconsistency in the readings, I, too, have read that glucose
drops from fingertips are the most accurate
. Other liquids are in the body, and if that particular "poke" caused a mixture of blood and other tissue liquids, your numbers could be slightly different from what his real glucose levels are. I test from fingertips and have had many types of glucometers in my 37 years with type 1 diabetes, and have never found them to be inaccurate.