Voriconazole is an antifungal medication mainly used to treat invasive mycotic infections, including Candida, Aspergillus, and other fungi. Voriconazole level assay measures the concentration of voriconazole in the blood. Monitoring helps therapeutic drug monitoring (TDM) as this molecule exhibits a narrow therapeutic range, enabling prescribed individualized dosing. Test aids in minimizing the risk of toxicity, timely intervention, or discontinuation of the medication.