The reference values for a "normal" random glucose test in an average adult are 80–140mg/dl (4.4–7.8 mmol/l), between 140 and 200mg/dl (7.8–11.1 mmol/l) is considered pre-diabetes, and ≥ 200 mg/dl is considered diabetes according to ADA guidelines1 (you should visit your doctor or a clinic for additional tests however as a random glucose of > 160mg/dl does not necessarily mean you are diabetic).
"Prediabetes | ADA". www.diabetes.org. https://www.diabetes.org/diabetes-risk/prediabetes?loc=superfooter ↩