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Erection Self-Test: Purpose, Risks, and Procedure
Erection Self-Test
Medically reviewed by Daniel Murrell, MD on November 22, 2017 — Written by the Healthline Editorial Team
What is an erection self-test?
An erection self-test is a procedure a man can do by himself to determine if the cause of his erectile dysfunction (ED) is physical or psychological.
It’s also known as the nocturnal penile tumescence (NPT) stamp test.
Why is an erection self-test performed?
The test is done to confirm that you experience erections at night. Men who have a normal physiological erectile function experience an erection during normal sleep.
According to the University of California, San Francisco Medical Center, the average healthy pubescent male will have between three to five spontaneous erections a night, lasting 30 to 60 minutes each.
Physical, emotional, or mental problems can lead to ED. This test helps determine if your ED is caused by physical problems.
The test is considered outdated. There are a variety of ways that it can be conducted. More reliable tests, such as NPT testing using a RigiScan, are now available.
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How to prepare for an erection self-test
You’ll need to buy four to six postage stamps. The denomination of the stamps doesn’t matter, but they should have dry glue on the back.
Stamps are the most convenient option, but there are other alternatives. If you don’t have stamps, you can use a strip of paper. The strip of paper should be 1 inch wide and long enough to go around the penis with a little overlap. The paper can be secured with a 1-inch piece of tape.
Abstain from alcohol or any chemical sleep aids for two nights before the test. These can prevent erections. You should also avoid caffeine to make sure you have a good night’s sleep.
How an erection self-test is performed
—-Steps
Change into briefs or boxer brief underwear before you go to bed. Take enough stamps to circle the shaft of your penis.
Pull your flaccid penis through the fly in your underwear. Moisten one of the stamps on the roll and wrap the stamps around your penis. Overlap the stamps in the roll to ensure they’ll stay securely in place. It should be snug enough so the stamps break apart if you have an erection. Place your penis back inside your shorts and go to bed.
For best results, sleep on your back so the stamps aren’t disturbed by your movement.
Do this three nights in a row.
——Results
Check to see if the roll of stamps is broken when you wake up in the morning. You could have had an erection in your sleep if the stamps are broken. This could indicate that your penis physically functions properly.
——Risks
There are no risks associated with an erection self-test.