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Fasting Insulin

Meaning

Fasting Insulin is the concentration of the hormone insulin measured in the peripheral circulation after a period of sustained fasting, typically 8 to 12 hours without caloric intake. This measurement serves as a critical clinical biomarker for assessing basal pancreatic beta-cell function and systemic insulin sensitivity. Elevated fasting insulin levels are a strong indicator of underlying insulin resistance, often preceding overt hyperglycemia. Maintaining low fasting insulin is a primary goal in metabolic wellness optimization.