For the basic blood work, you have to be on a least a 12 hour fast, water only, for the cholesterol and the serum glucose. You will not be eating, but do not get dehydrated. That can shift all of the lab numbers.
There is no need to test for LH or FSH to diagnose type 1 hypogonadism. Ask what tests do not need to be done when there are no testicles.
Your DHT will be low and any amount of TRT will increase this. Testing for TT and FT when there are no testes is probably not needed, but may be required so the insurance coverage can see a lab supported diagnosis.
TRT will change all of the numbers. Doctors like to see things change, even when there is nothing useful they can do with the information of how it increased. If DHT gets too high, then they get concerned. But that does not need a baseline.
TRT: You may see a drop in cholesterol and some improvement in serum glucose if elevated now. Blood pressure should go down if it is higher than it should be.
You need the freedom to self inject. You cannot be tied down to a doctors office all of your life. You will not need hCG if the undescended teste is non functional.
HRT is not a single hormone. You also need to balance your T:E ratio. E2 in the lower 20’s would provide the optimal results.
You can inject T with an insulin syringe EDO to get a more natural and steady level of T. This will also avoid T spikes which lead to higher SHBG and lower FT.
If your maturation/virilization was cut short, you will need higher T levels to deal with that. TT=900-1000 should be your goal.
What is the condition of your skin? Less elastic or thinner? If not, then you have been spared some of the decline from low T.
Let the doctor know that you are interested, learning and not passive. She will then have a sense that you will be appreciating what she does.
Testing. Your pregnenolone is probably quite low. That should be tested. When that is low, DHEA levels may then be low. Test for DHEAs not DHEA.
Your PSA should be tested. Never get tested after recent sex or masturbation, as that will cause PSA levels to surge and create lab numbers that do no represent anything. Ditto for a DRE. Pressure on the prostate also releases PSA. If the doc does the DRE and sends you for labs on the way out, that is obviously a problem. Otherwise, ejaculation is vital to men’s health.
At your age and low hormone levels, you prostate has no reason to be enlarged and there may not be a prostate exam unless a rigid protocol calls it up.