This result signifies that this patient has [X copies of a normal function allele (*_xN)] [X copies of a decreased function allele (*_)] [X copies of a no function allele (*_)]. Based on the genotype result this patient is predicted to be an ultrarapid metabolizer of CYP2D6 substrates. This patient may be at risk for an adverse or poor response to medications that are metabolized by CYP2D6. To avoid an untoward drug response, dose adjustments may be necessary for medications metabolized by CYP2D6. Please consult a clinical pharmacist for more information about how CYP2D6 metabolic status influences drug selection and dosing.