At what blood glucose level are signs and symptoms of hypoglycemia visible?

• A. Above 180 mg/dL
• B. Below 70 mg/dL
• C. Between 90 and 110 mg/dL
• D. Exactly 100 mg/dL

Answer: (B)

The important idea is that hypoglycemia is defined by blood glucose falling below a threshold, and symptoms usually appear as glucose drops toward that level. When glucose is under 70 mg/dL, the body's counterregulatory system activates to raise血 glucose, leading to recognizable signs such as sweating, shakiness, palpitations, and anxiety. If it falls even further, brain function starts to be affected directly, causing confusion, dizziness, or weakness. So signs and symptoms of hypoglycemia are typically visible at below 70 mg/dL. Levels much higher, like 180 mg/dL, reflect hyperglycemia and aren’t associated with hypoglycemic symptoms, and normal fasting ranges are about 90–110 mg/dL. Some individuals may notice symptoms at slightly different levels, but below 70 mg/dL is the standard threshold.