I had the first discussion with my urologist after getting two TT tests that were approximately 300 - just on the cusp. But that was not enough to prescribe. He did not take a paint by numbers approach. He wanted to know how I was feeling, and I told him about my malaise, lack of energy, mental fog, loss of muscle tone and other symptoms that he ultimately associated with low T, in the absence of any other explanation. Blood tests confirmed primary vs. secondary andropause. Bone density test also showed loss of mass, other telltale consequence of low T. On the strength of clinical and lab results, he not only prescribed cypionate, he presented my case to my insurance carrier which has paid for my therapy for the past three years.
Moral - as suggested above. Do not go in blind. Prepare for the appointment. Take control of the conversation. Make it as easy as possible for the doc to prescribe. Ask him what the differential diagnoses are and tell him that you are prepared to explore them. Remember, my friend, you are 28. If you start this therapy, it will be for the duration, which could be 60-70 years. I was in my late 50's when I started and have utterly no regrets. Indeed, I can not imagine what my life would be like without this therapy. But I have made three boys, have been married since the dawn of creation and am a very different stage of life than you are.
If testosterone proves to be the right treatment choice, I along with most on this board recommend injections vs gels, pellets or whatever else big pharma my throw at you. Keep it simple. Pinning is no big deal. And even if it is, consider it an expression of commitment to your health. Ain't no skin in game when you are rolling on a steroid-infused deodorant.
Wish you all the best.