What is the purpose of liver function tests in patients on methotrexate?

The purpose of liver function tests in patients on methotrexate is to detect liver toxicity. Methotrexate is an antimetabolite and immunosuppressant that can cause hepatotoxicity, especially when used long-term or at high doses. Regular monitoring of liver enzymes, such as alanine aminotransferase (ALT) and aspartate aminotransferase (AST), helps identify any early signs of liver damage. This monitoring is crucial because liver toxicity can lead to more severe complications, and early detection can allow for interventions such as dose adjustment or discontinuation of the drug to minimize risks.

The other options are relevant to different aspects of patient care. Monitoring drug levels is important for some medications, but methotrexate is typically not monitored this way. Assessing kidney function is also important in patients on methotrexate, as the drug can affect renal function; however, this does not specifically relate to the purpose of liver function tests. Hormone levels are generally unrelated to the monitoring provided through liver function tests in the context of methotrexate therapy. Hence, the primary aim of liver function tests in this scenario focuses on identifying potential liver damage.