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Cavernosography: Used in conjunction with the dynamic infusion cavernosometry, this test involves injecting a dye into the penis. The penis is then X-rayed so that the venous leak can be seen. Nocturnal penile tumescence (NPT): This test measures a man's erectile function while he is sleeping. Normally, a man will have five or six erections while asleep. A lack of these erections may indicate there is a problem with nerve function or circulation to the penis. The test uses two methods, the snap gauge method and the strain gauge method. The snap gauge method is performed by wrapping three plastic bands of varying strength around the penis. Erectile function is then measured based on which of the three bands breaks. The strain gauge method works by placing elastic bands around the tip and base of the penis. If the penis becomes erect during the night, the bands stretch, measuring the changes in penile circumference. best price viagra viagra without prescription looking for viagra ? brand viagra without prescription online By Steven Reinberg HealthDay Reporter