Whereas toxicology tests ‘what’ medications are in the patient’s system, DNA testing tests ‘how’ a patient metabolizes their medications. We use a CLIA certified DNA Laboratory partner to study the role of genetics in drug response. By providing results within four days for comprehensive CYP genetic testing panels, physicians can use the results to guide therapeutic decisions, which may mitigate the incidence of costly adverse drug reactions (ADRs) and improve efficacy.