If my glucose reading is less than the safe 120, can I ne sure that I am non-diabetic?
No, because about 10% of us are blood type hypo (not hyper) glycemians. Their safe glucose reading is 70, not 120. A hyperglycemic with a glucose reading of 146 has a body under attack. A hypoglycemic with a reading of 96 (also 26 points too high) also has a body under attack, and needs to be on a treatment plan.