Tests and diagnosisBy Mayo Clinic staff
For many men, a physical exam and answering questions (medical history) are all that's needed before a doctor is ready to recommend a treatment. If your doctor suspects that underlying problems may be involved, or you have chronic health problems, you may need further tests or you may need to see a specialist.
Tests for underlying problems may include:
- Physical exam. This may include careful examination of your penis and testicles and checking your nerves for feeling.
- Blood tests. A sample of your blood may be sent to a lab to check for signs of heart disease, diabetes, low testosterone levels and other health problems.
- Urine tests (urinalysis). Like blood tests, urine tests are used to look for signs of diabetes and other underlying health conditions.
- Ultrasound. This test can check blood flow to your penis. It involves using a wand-like device (transducer) held over the blood vessels that supply the penis. It creates a video image to let your doctor see if you have blood flow problems. This test is sometimes done in combination with an injection of medications into the penis to determine if blood flow increases normally.
- Overnight erection test. Most men have erections during sleep without remembering them. This simple test involves wrapping special tape around your penis before you go to bed. If the tape is separated in the morning, your penis was erect at some time during the night. This indicates the cause of your erectile dysfunction is most likely psychological and not physical.
- Psychological exam. Your doctor may ask you questions to screen for depression and other possible psychological causes of erectile dysfunction.
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