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    What Tests Will a Urologist Do If I Have ED? - WebMD

    For this test, you will place a device around your penis before you go to sleep. It measures how many erections you have and how strong they are. A simpler version of this test uses a special ...

    Tests for Erection Problems - Kaiser Permanente

    These medicines include sildenafil (Viagra), tadalafil (Cialis), and vardenafil (Levitra). Do not drink alcohol or take sleeping pills for 2 days before you have an NPT test. The alcohol and the pills can change your deep sleep time. ... The test is more accurate if repeat tests show the same results. Intracavernosal injection test. An erection ...