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Glucose is the primary sugar your body uses for energy, and its fasting blood level is one of the first signs of metabolic dysfunction. A reading above 100 mg/dL in a fasted state signals early insulin resistance — a fully reversible condition when caught before it progresses to type 2 diabetes. Understanding your glucose result is the foundation of metabolic health monitoring.
Also known as: Blood Glucose, Blood Glucose (Fasting), Blood Sugar, Blood Sugar (Fasting), Blood sugar (FBS), Estimated Average Glucose, Fasting Blood Glucose, Fasting Blood Sugar
High fasting glucose indicates insulin resistance, prediabetes, or diabetes. Low glucose causes confusion, shakiness, and fainting from excess insulin or adrenal insufficiency.
Standard fasting range is 70-99 mg/dL. Functional practitioners target 75-88 mg/dL. Research links fasting glucose above 90 mg/dL to higher cardiovascular risk.