Answer:
The test used to diagnose gestational diabetes in a patient is the 3-hour glucose tolerance test.
Step-by-step explanation:
During this test, the patient is asked to fast overnight. In the morning, a blood sample is taken to measure the fasting blood glucose level. Then, the patient is given a sugary drink containing a specific amount of glucose. Blood samples are taken at regular intervals over a three-hour period to measure the blood glucose levels.
The results of this test help determine if the patient's body is effectively processing glucose. If the blood glucose levels are higher than normal during the test, it indicates that the patient has gestational diabetes. This test is commonly used because it provides a more accurate diagnosis compared to other tests like the 1-hour glucose tolerance test.
Therefore, the correct answer is D. 3-hour glucose tolerance test.