{"Azathioprine can be affected by a patient's TPMT and NUDT15 phenotype. This patient is predicted to be a NUDT15 poor metabolizer and is at high risk for life threatening myelosuppression with normal doses of azathioprine and should receive greatly reduced doses. For non-malignant conditions, consider alternative non-thiopurine immunosuppressant therapy. For malignant conditions, start with drastically reduced normal daily doses (reduce daily dose by 10 fold) and adjust doses of azathioprine based on degree of myelosuppression and disease-specific guidelines. Allow 4-6 weeks to reach steady-state after each dose adjustment. TPMT phenotype could not be assigned based on genotyping performed. 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. If thiopurines are required and TPMT status is unknown, monitor closely for toxicity. Please consult a clinical pharmacist for more information."}