A medical system includes an implantable lead having a plurality of electrode contacts, a pulse generator coupled to the lead and configured to generate electrical pulses to be delivered to a patient through the plurality of electrode contacts, and an electronic programmer coupled to the pulse generator. The electronic programmer programs the pulse generator to generate the electrical pulses. The pulse generator is programmed to generate an electrical stimulation to be applied to the patient via one of the electrode contacts on the implantable lead. A determination is received as to whether the patient, in response to the electrical stimulation, exhibited a bellows response or a toes response. A stimulation parameter of the electrical stimulation is ramped up in response to a determination that the patient did not exhibit the bellows response or the toes response and that the patient did not feel pain in response to the electrical stimulation.