This result signifies that the patient has one copy of a normal function allele and one copy of an uncertain function allele OR one copy of a decreased function allele and one copy of an uncertain function allele OR two copies of an uncertain function allele. The expected phenotype for this patient cannot be determined currently based on the NUDT15 diplotype result. If thiopurines are required and NUDT15 status is unknown, monitor closely for toxicity. Please consult a clinical pharmacist for more specific information about how NUDT15 function influences drug dosing.