Physicians generally advise their patients to continue taking all medications except anticoagulants (e.g. warfarin). Generally, antiplatelet agents are continued. These medications interfere with normal blood clotting and may be reduced or discontinued at some point before the test. Diabetic patients who need additional guidance should ask their physician about any specific instructions. Finally, patients are encouraged to bring copies of any previous tests done by their primary physician, such as an electrocardiogram (EKG).

Immediately before the test, patients will be asked various questions about their medical history. Patients are urged to discuss any history they may have had of blood clotting disorders or an allergic reaction to any of the following: