Your asking a endocrinologist to diagnose your sexual issue. That is like asking a car mechanic what is wrong with your broken television. It is not their specialty. He looks at blood counts each day, and assesses whether someones numbers fall into the averages deemed normal by millions of previous tests over the past years. He did his job 100% as accurately as his job entails.
Irregardless of your condition leading to your ED (which I have previously said is 100% related to a 400 something test count and still feel this), there are only three treatments: Cialis, Viagra, Levitra. Other than that there is no miracle cure for ED. You need to try one of these drugs and see if you can get some help from them.
You can still go to a urologist, but all he will do is test for blood flow to your penis using ultrasound. If he deems you have poor circulation, guess what, he'll perscribe Cialis, Viagra, or Levitra. He can look at your bloodwork and see that you have a test count that is on the low levels of normal, but if still in the normal range, he won't give you any kind of hormone therapy.