| Diagnostic evaluation |
| For all patients |
| History to include sexual, genitourinary, medical, surgical, psychosocial, medications, response to oral PDE5 inhibitors |
| Physical exam |
| For patients complaining of sensory loss |
| Biothesiometry (measures of threshold of appreciation of vibration) |
| Hot and cold perception (assess for integrity of the dorsal nerve) |
| For patients who report complete failure with oral PDE5 inhibitors |
| Combined injection and stimulation test (assess response to small amount of low dose bimix papaverine 30 mg/phentolamine 0.5 mg) with supine and upright posture |
| For patients with poor response to both PDE5 inhibitors and injection |
| Consider penile color duplex ultrasound (PCDU) |
