What test is commonly used to assess carbohydrate metabolism?

The Glucose Tolerance Test (GTT) is the standard assay used to evaluate carbohydrate metabolism. This test assesses how well the body can process glucose after fasting and following a glucose-rich drink. It specifically measures the subject's blood glucose levels at various intervals after ingestion of the glucose solution, providing insights into insulin sensitivity and overall glucose metabolism.

Individuals who exhibit impaired glucose tolerance can be identified through this test, which can be an early indicator of conditions such as prediabetes and diabetes. The GTT is particularly valuable in clinical settings for monitoring glucose homeostasis and diagnosing potential metabolic disorders.

In contrast, the other tests listed serve different diagnostic purposes. A complete blood count (CBC) evaluates blood cells and can help diagnose various conditions, but it does not assess carbohydrate metabolism directly. A lipid panel measures fats and cholesterol levels in the blood to evaluate cardiovascular risk rather than metabolic disorders related to carbohydrates. Similarly, thyroid function tests assess thyroid hormone levels, which can influence metabolism broadly but do not specifically evaluate carbohydrate metabolism. This distinction highlights why the GTT is the appropriate choice for assessing carbohydrate metabolism directly.