The OGTT involves several key steps: 1. Fasting: The individual fasts for at least 8 hours prior to the test. 2. Baseline Measurement: A fasting blood sample is taken to determine the baseline glucose level. 3. Glucose Consumption: The individual drinks a solution containing 75 grams of glucose. 4. Monitoring: Blood samples are collected at 30-minute intervals for up to 2 hours to monitor glucose levels.