What is a normal blood sugar?

Blood sugar has three normal lines because there are three ways to measure it. Fasting glucose (nothing eaten for 8 hours): 70 to 99 mg/dL is normal; 100 to 125 is prediabetes; 126 and up, confirmed on a repeat, is diabetes. Random glucose (any time of day): under 140 mg/dL is expected. A1C (the three-month average, no fasting needed): under 5.7 percent normal, 5.7 to 6.4 prediabetes, 6.5 and up diabetes territory, per MedlinePlus. The prediabetes band deserves respect rather than panic: it is the warning that arrives while reversal is still realistic - the evidence that weight loss, regular activity, and food-pattern change can return numbers to normal is strongest exactly there. Low sugar counts too: below 70 mg/dL is hypoglycemia - shakiness, sweating, confusion - mainly a concern for people on insulin or certain diabetes medications, and it needs fast sugar (juice, glucose tabs) and, if severe, emergency help. Context moves numbers: illness, stress, steroids, and a big meal all push readings up temporarily, so one high number is a prompt to confirm, not a verdict. Home meters are for management; the lab A1C is for diagnosis. Pymander is a free AI doctor, 24/7 by text, that can help you read your numbers in context.