Investigations

Vibratory perception of penis – It is done by placing a vibrating tuning fork at the base of the penis. Presence of sense of vibration indicates the intact nerve function in an individual.
Monitoring nocturnal penile tumescence – It is a non-invasive procedure which is done in a “Sleep laboratory” in form of an overnight investigation. The patient is made to sleep for 8 hours in the hospital where his other body functions related to sleep and penile erections are monitored.
Measuring blood pressure of penis with penile plethysmography.
Ultrasound (Doppler) flowmetry – The blood supply of the penis is assessed with help of an ultrasound machine.
Pudendal nerve latency time – This is done to rule out any problem with the nerve supply of the penis.
Glucose tolerance test – It rules out the presence of diabetes as the cause of impotence / orgasm failure.
Plasma hormone assay (sex hormones) – The sex hormone levels in the blood are evaluated.
Liver function test – Male sexual problems can result due to liver failure.
Thyroid function test – Lack of thyroid hormones can affect the sexual life of both the sexes.
Penile arteriography – It is done to assess the blood supply to the penis.
Radio active Xenon penography – It is also done to assess the blood perfusion of the penis.