What Are Normal Blood Sugar Levels?
They're less than 100 mg/dL after not eating (fasting) for at least 8 hours. And they're less than 140 mg/dL 2 hours after eating.
During the day, levels tend to be at their lowest just before meals. For most people without diabetes, blood sugar levels before meals hover around 70 to 80 mg/dL. For some people, 60 is normal; for others, 90.
What's a low sugar level? It varies widely, too. Many people's glucose won't ever fall below 60, even with prolonged fasting. When you diet or fast, the liver keeps your levels normal by turning fat and muscle into sugar. A few people's levels may fall somewhat lower.
- Fasting plasma glucose test. The doctor tests your blood sugar levels after fasting for 8 hours and it’s higher than 126 mg/dL.
- Oral glucose tolerance test. After fasting for 8 hours, you get a special sugary drink. Two hours later your sugar level is higher than 200.
- Random check.The doctor tests your blood sugar and it’s higher than 200, plus you’re peeing more, always thirsty, and you’ve gained or lost a significant amount of weight. He’ll then do a fasting sugar level test or an oral glucose tolerance test to confirm the diagnosis.
Almost any part of your body can be harmed by too much sugar. Damaged blood vessels cause problems such as:
- Kidney disease or kidney failure, requiring dialysis
- Heart attacks
- Vision loss or blindness
- Weakened immune system, with a greater risk of infections
- Erectile dysfunction
- Nerve damage, also called neuropathy, that causes tingling, pain, or less sensation in your feet, legs, and hands
- Poor circulation to the legs and feet
- Slow wound-healing and the potential for amputation in rare cases
Keep your blood sugar levels close to normal to avoid many of these complications. The American Diabetes Association's goals for blood sugar control in people with diabetes are 70 to 130 mg/dL before meals, and less than 180 mg/dL after meals.
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