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Was the flow test a measure of urine flow or a test of blood flow?
Have you had any neurologic evaluation?
Thank you for the clarification.
There are both medical and psychological conditions that can interfere with erections. The doctors have evaluated for prostate disease and common metabolic conditions that can cause this. Additional medical conditions that cause difficulty with or loss of erections are diseases that affect blood flow or nerve function to the penis. There are ultrasound tests that can assess blood flow. The first step in a neurologic evaluation would be a neurologic examination.
A low testosterone also can affect erections, but may have been checked when other blood work was checked.
Common psychologic causes of difficulty with erections include anxiety and depression. If you are known to have one of these conditions, that would be suspicious of being the cause of the difficulty with erections.
There are also many men in whom a specific cause cannot be identified, but the above tests would be the usual evaluation to identify an underlying cause.
Is there any additional information that would be helpful?
Many men find an encounter with a partner to be more stimulating. However, any of the conditions noted above can be the underlying cause the difficulty with achieving or maintaining an erection.