<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing problems with erectile dysfunction lately. Its really starting to worry me.  <response>: Im sorry to hear that. In order to determine the cause of your erectile dysfunction, we will need to perform several medical tests. These include hematologic tests, a urinalysis, a prostate specific antigen measurement PSA test, a rectal examination, a lipid panel, ultrasonography, and a hemoglobin A1c measurement. 