Glucose, 2-Hour Post-Load (OGTT)
This test measures your blood glucose exactly two hours after you drink a standardized sugary solution during an oral glucose tolerance test (OGTT). It shows how efficiently your body clears sugar from the bloodstream after a defined challenge.
The two-hour post-load value reveals how your body handles a glucose load in a way that a fasting number alone can miss. It is a key part of screening for prediabetes and diabetes, and it is the standard approach for diagnosing gestational diabetes in pregnancy. Because it stresses the system, it can catch glucose-handling issues early.
A higher two-hour value suggests your body is clearing glucose more slowly than expected, which may indicate impaired glucose tolerance or diabetes depending on the level. Illness, stress, or certain medications can also influence the result. Your clinician confirms the meaning alongside your other tests.
A lower two-hour value generally means your body cleared the glucose load efficiently, which is reassuring. Unusually low readings are less common and are interpreted in the context of how you felt during the test.
Many labs consider a two-hour value below 140 mg/dL to be in the typical range, with higher thresholds defining prediabetes and diabetes. Your clinician will interpret your result against the standard used for your situation.
Sources
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.