{"Azathioprine can be affected by a patient's TPMT and NUDT15 phenotype. TPMT phenotype could not be assigned based on genotyping performed. NUDT15 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 azathioprine is required and TPMT genotype status is unknown, consider evaluating TPMT erythrocyte activity to assess TPMT phenotype. Erythrocyte TPMT activity test results can be unreliable in the case of recent red blood cell transfusions. Monitor closely for toxicity. Please consult a clinical pharmacist for more information."}