The Oral glucose tolerance test (OGTT) looks at blood sugar before and after a sugar drink. It is done for: diagnosing diabetes in pregnancy and unclear cases.
General health information, not a diagnosis. In an emergency, call 102. Always consult a qualified health professional.
Diagnosing diabetes in pregnancy and unclear cases.
Fast overnight; the test takes about 2 hours. Laboratory-specific; see the reference range on your report. High or positive may mean: Diabetes or gestational diabetes. Low or negative may mean: Normal glucose tolerance. General information, not a diagnosis. Results must be interpreted by a qualified health worker.
Blood sugar before and after a sugar drink.
Blood
Diabetes or gestational diabetes.
Normal glucose tolerance.
Reference ranges vary by lab, age and sex — always use the range printed on your own report.
Consult a doctor to interpret results — a single test does not make a diagnosis.
Uses your location once to list the nearest facilities. Nothing is stored.
What does the Oral glucose tolerance test (OGTT) measure?
Blood sugar before and after a sugar drink.
Why is the Oral glucose tolerance test (OGTT) done?
Diagnosing diabetes in pregnancy and unclear cases.
Do I need to fast for the Oral glucose tolerance test (OGTT)?
Fast overnight; the test takes about 2 hours.
What does a high or positive Oral glucose tolerance test (OGTT) mean?
Diabetes or gestational diabetes.
What does a low or negative Oral glucose tolerance test (OGTT) mean?
Normal glucose tolerance.
What is the normal range for the Oral glucose tolerance test (OGTT)?
Laboratory-specific; see the reference range on your report.
Why is Oral glucose tolerance test (OGTT) done?
Diagnosing diabetes in pregnancy and unclear cases.
Do I need to prepare or fast for Oral glucose tolerance test (OGTT)?
Fast overnight; the test takes about 2 hours. Laboratory-specific; see the reference range on your report. High or positive may mean: Diabetes or gestational diabetes. Low or negative may mean: Normal glucose tolerance. General information, not a diagnosis. Results must be interpreted by a qualified health worker.
SI text CC BY 4.0; decoder reference data (cited per range); LOINC codes free with attribution (notice included).
Sources: SI health summary (own words); MedlinePlus Lab Tests and CDC as references