Final answer:
During an Oral Glucose Tolerance Test (OGTT), the patient should drink the glucose solution and have their blood glucose measured every half an hour for 2½ hours.
Step-by-step explanation:
The patient should drink the glucose solution required for an Oral Glucose Tolerance Test (OGTT) within a specific time period. During an OGTT, the patient is given an oral dose of 50-60 grams of glucose in 300 ml of water. The blood glucose level is measured every half an hour after ingestion of glucose.
The ability of the individual to tolerate glucose is assessed by monitoring the blood glucose levels over time. In normal individuals, the blood glucose level rises in one hour and falls below the fasting level in another half to one hour. It then reaches back to normal within 2½ hours.
Therefore, for the OGTT, the patient should drink the glucose solution and have their blood glucose measured every half an hour for a total duration of 2½ hours.