What is an oral glucose tolerance test (OGTT)?
An oral glucose tolerance test (OGTT) is a blood test performed during pregnancy, usually between 24-28 weeks, to screen for gestational diabetes by measuring how your body processes glucose after consuming a sugar drink.
The OGTT is a screening test used to detect gestational diabetes, a form of high blood sugar that develops during pregnancy. Most pregnancy care centers in Kuala Lumpur offer this test as part of routine antenatal care during the second and third trimesters.
The test typically follows a standard procedure. You fast for 8-10 hours before arriving at your clinic. You then drink a glucose solution containing 75 grams of glucose and wait two hours. Blood samples are drawn at specific intervals (usually fasting, at one hour, and at two hours) to measure your blood glucose levels at each stage. The results show whether your body is managing glucose properly or whether gestational diabetes may be present.
Screening at 24-28 weeks is the standard timing because gestational diabetes often develops in the second half of pregnancy. Early detection allows your healthcare provider to manage the condition through diet, exercise, or medication if needed, which protects both your health and your baby's development.
If your OGTT results fall outside normal ranges, your care provider will discuss next steps, which may include repeat testing, dietary adjustments, or specialist referral. Many prenatal checkup providers in the Kuala Lumpur area include OGTT as part of their standard antenatal screening package.