Final answer:
For a glucose tolerance test, a woman must fast overnight for 12-14 hours to accurately diagnose diabetes mellitus by assessing the body's response to an oral glucose challenge.
Step-by-step explanation:
For a glucose tolerance test (GTT), typically used to diagnose diabetes mellitus, a fasting period of 12-14 hours is required. This means that the correct answer is a) Yes, overnight fasting required. During the fasting state, the body relies on stored glycogen, and the blood glucose levels begin to drop. Endocrinologists utilize such tests to assess the pancreatic function by measuring the blood glucose levels after the administration of a sugary drink. If the pancreas is functioning properly, the blood-glucose level will return to a normal range after the ingestion of glucose.
The glucose tolerance test (GTT) is a diagnostic test to assess an individual's ability to tolerate glucose and determine if they have diabetes mellitus. During the test, the patient is required to fast for 12 to 24 hours. Then, they are given a sugary drink, which stimulates the pancreas to produce insulin to decrease blood-glucose levels. A blood sample is taken one to two hours after consuming the sugary drink to determine if the pancreas is functioning properly and if the blood-glucose level is within a normal range.