Lab marker · Low

Low Fasting Blood Glucose: what it means

A Fasting Blood Glucose result below the normal range is considered low. Here is what a reduced Fasting Blood Glucose can point to, and when it is worth discussing with a doctor.

Reference range: Normal 70–99 mg/dL fasting; prediabetes 100–125; diabetes ≥126

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What a low Fasting Blood Glucose can mean

  • Hypoglycaemia — symptomatic below 70 mg/dL: shakiness, sweating, confusion.
  • Insulin overdose / sulfonylurea — common in treated diabetes.
  • Prolonged fasting, alcohol on empty stomach, heavy exercise.
  • Rare conditions — insulinoma, adrenal insufficiency.

When to discuss with a doctor

Fasting glucose 100–125 mg/dL once is worth repeating; persistent values in this range need a primary-care visit to discuss lifestyle and possibly an HbA1c. A reading ≥126 mg/dL with symptoms (excessive thirst, frequent urination, weight loss) warrants prompt evaluation. Mediora.AI plots your fasting trajectory alongside HbA1c so the pattern is obvious.

Conditions this can relate to

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Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.