Which laboratory test is crucial to monitor in patients on INH therapy?

Monitoring liver function tests in patients undergoing isoniazid (INH) therapy is critical due to the potential hepatotoxicity associated with this medication. INH is known to cause liver enzyme elevations, which can progress to more severe liver injury in some patients. Regular assessment of liver function helps to detect any adverse effects early and allows for timely intervention, ensuring patient safety while on the treatment regimen.

Conversely, while a complete blood count can be informative, it isn’t specifically highlighted in the context of INH therapy. Thyroid function tests and electrolyte levels may be relevant in other clinical scenarios but do not directly relate to the risks associated with INH. Thus, routine liver function tests stand out as the essential monitoring tool for patients receiving isoniazid, emphasizing the importance of vigilance in managing potential drug-related liver issues.