This result signifies that the patient has one or two copies of HLA-A*31:01. Patients with this genotype are at increased risk of severe cutaneous adverse reactions, including Stevens-Johnson syndrome/toxic epidermal necrolysis (SJS/TEN), drug reaction with eosinophilia and systemic symptoms (DRESS), and maculopapular exanthema (MPE), with certain aromatic anticonvulsants (e.g., carbamazepine). Alternative therapy may be warranted. Please consult a clinical pharmacist for more information.