{"Thioguanine can be affected by a patient's TPMT and NUDT15 phenotype. TPMT genotype does not appear to have been ordered for this patient. Based on those results, use of an alternative dose or drug may be recommended. If thioguanine is required and TPMT genotype status is unknown, consider evaluating TPMT erythrocyte activity to assess TPMT phenotype. Erythrocyte TPMT activity test results can be falsely low at diagnosis of leukemia and is unreliable in the case of recent red blood cell transfusions. NUDT15 phenotype could not be assigned based on genotyping. Monitor closely for toxicity. Please consult a clinical pharmacist for more information."}