Often, the first step in diagnosing epididymitis is a urinalysis to identify any acute infections or inflammatory conditions in the urine. If the doctor suspects an STI, they may obtain a culture from the tip of the penis to identify the bacteria causing it.
Depending on the extent of the infection, the doctor may use an ultrasound to determine if the blood supply to the testes is compromised. A CT scan can identify any problems in the bladder or kidneys.

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