Final answer:
The nurse would normally receive physician's orders to have the patient be NPO for at least 8 hours before the Oral Glucose Tolerance Test (OGTT). During this test, the patient is required to fast for 8 hours before drinking a sugary solution, and blood glucose levels are measured at regular intervals to assess the ability to tolerate glucose and diagnose diabetes mellitus.
Step-by-step explanation:
The test for which the nurse would normally receive physician's orders to have the patient be NPO for at least 8 hours before the test is the Oral Glucose Tolerance Test (OGTT). During this test, the patient is required to fast for 8 hours before drinking a sugary solution, and blood glucose levels are measured at regular intervals to assess the ability to tolerate glucose and diagnose diabetes mellitus.