In pregnancy amount of glucose used in Glucose Tolerance Test is:
**Core Concept**
The Glucose Tolerance Test (GTT) is a diagnostic tool used to assess the body's ability to regulate blood glucose levels. In pregnancy, GTT is used to screen for gestational diabetes mellitus (GDM). The test involves measuring blood glucose levels after consuming a standardized glucose solution.
**Why the Correct Answer is Right**
The correct amount of glucose used in the GTT during pregnancy is 75 grams. This is because the American College of Obstetricians and Gynecologists (ACOG) recommends a 75-gram glucose solution for the screening test. The 75-gram dose is sufficient to stimulate an adequate insulin response in pregnant women, allowing for the detection of impaired glucose tolerance. The oral glucose load is typically consumed within a 5-minute period.
**Why Each Wrong Option is Incorrect**
* **Option A:** 50 grams - This dose is too low to effectively stimulate insulin secretion and may not accurately diagnose impaired glucose tolerance in pregnant women.
* **Option B:** 100 grams - While a higher dose may be used in some diagnostic tests, 100 grams is not the standard recommended for pregnant women.
* **Option C:** 150 grams - This dose is excessive and is not recommended for screening pregnant women for GDM.
**Clinical Pearl / High-Yield Fact**
When performing a Glucose Tolerance Test in pregnancy, it's essential to ensure that the patient has not eaten or drunk anything other than water for at least 8 hours before the test and has not taken any medications that could interfere with glucose metabolism.
**Correct Answer: D. 75 grams**