{"Azathioprine can be affected by a patient's TPMT and NUDT15 phenotype. Neither a TPMT or NUDT15 genotype appears to have been ordered for this patient. Based on those results, use of an alternative dose or drug may be recommended. If thiopurines are 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. Please consult a clinical pharmacist for more information."}