Therefore, elevated levels of AP will indicate that something is wrong with the liver only if the amount of
GGT is raised as well. Keep in mind that,
GGT can be elevated without AP being elevated, as GGT is a sensitive marker of alcohol ingestion and certain hepatotoxic (liver toxic) drugs. It should be noted that for unclear reasons, people who smoke cigarettes appear to have higher AP and GGT than nonsmokers. Also, levels of AP and GGT are most accurate after a twelve-hour fast.