Nocturnal penile tumescence (NPT) stamp test; Nighttime penile tape test
Normal Values
During at least one of the nights, the ring of stamps is broken between any two stamps.
What abnormal results mean
If the stamps are broken it may suggest that the erection problem is the result of psychological causes. If the stamps are not broken on any of the 3 nights it may indicate that the erection problem is related to physical conditions or medications (see







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