This result signifies that this patient has [1 copy of a decreased function allele with an activity value of 0.5 (*_)] or [2 copies of a decreased function allele with an activity value of 0.25 (*_x2)] and one copy of a no function allele (*_) OR two copies for a decreased function allele with an activity value of 0.25 (*_/*_). Based on the genotype result this patient is predicted to be an intermediate 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.