Which test is sensitive enough to detect moderate drinking over a few weeks?

The ability to detect moderate drinking over a few weeks is specifically associated with Carbohydrate Deficient Transferrin (CDT) testing. CDT is a biomarker used to indicate alcohol consumption and is particularly sensitive to changes in drinking patterns. When an individual consumes alcohol regularly, the carbohydrate composition of the transferrin protein alters, allowing CDT to serve as an accurate indicator of even moderate drinking levels.

Unlike other tests, such as Gamma-glutamyltransferase (GGT), Aspartate aminotransferase (AST), or Alanine aminotransferase (ALT), which can indicate liver inflammation or damage due to various causes (not solely alcohol), CDT is more specifically focused on detecting alcohol consumption. Additionally, GGT can be elevated in a variety of conditions unrelated to alcohol use and AST/ALT are more closely tied to liver function rather than alcohol-specific consumption patterns.

Therefore, the effectiveness of CDT in reflecting moderate drinking behavior over a period makes it the appropriate choice for this question.