Tests for Erection Problems
Tests are usually done for at least two nights in a row. If good erections occur during sleep, the cause of the erection problems probably is not physical.
The NPT test may also be called the stamp test or the rigidity test.
Intracavernosal injection test
During this test, the doctor injects a medicine (usually alprostadil) into the side of the penis to make an erection. This is called an intracavernosal injection. A similar medicine may also be placed into the urethra , the tube through which urine leaves the penis. This is called an intraurethral injection. The fullness of the erection and how long the erection lasts are measured.
Doppler ultrasound test
Doppler ultrasound (also called color duplex Doppler) uses a handheld tool passed lightly over the penis. The tool uses reflected sound waves to estimate the speed and direction of blood as it flows through a blood vessel. The sound waves go to a computer that changes the sounds to colors that are overlaid on a picture of the blood vessel. This shows the speed and direction of blood flow. You may need to have medicine injected into your penis (intracavernosal injection) to cause an erection before the Doppler test is done.
The results of your tests may show which kind of treatment is a good choice for you.
Erection Problems: Should I Try Injection Treatments?
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Why It Is Done
Tests for erection problems are done to help find whether the cause of an erection problem is physical, psychological, or a combination of both.
Physical conditions that may cause erection problems include:
Psychological tests may be needed if no physical cause is found for an erection problem. Psychological causes of erection problems may include: