What does a glucose tolerance test show about insulin resistance?

Insulin helps glucose move from the bloodstream into the body’s cells. With insulin resistance, cells respond less effectively, so the pancreas may need to release more insulin to keep glucose controlled. A glucose tolerance test tracks blood glucose after a prepared drink and may reveal a pattern that needs further assessment.

The test does not measure insulin resistance in isolation, and one result cannot explain every cause of altered glucose handling. Pregnancy, illness, medicines, recent food, and the testing protocol can all matter when a clinician interprets the findings.

Follow preparation instructions carefully and tell the clinic about medicines, pregnancy, illness, and any difficulty fasting. Keep the appointment for result discussion, because the next step may involve repeat testing, glucose checks, nutrition guidance, or monitoring rather than a conclusion from the drink alone.

Learn about the procedure through [Glucose Tolerance Test](/treatments/pregnancy-and-birth-care/glucose-tolerance-test/). If you are pregnant, an [Antenatal Care Package](/treatments/pregnancy-and-birth-care/antenatal-care-package/) may provide a wider setting for follow-up.

Ask for prompt help if you develop severe weakness, confusion, fainting, repeated vomiting, or trouble breathing during or after testing. Outside the appointment, contact your clinician about ongoing excessive thirst, frequent urination, unexplained weight change, or symptoms that are worsening.

What does my pattern of results show? Could pregnancy, illness, or medication have affected it? Do I need another glucose test or home monitoring? What changes should I make now? When should we review the result?