What are the rest of your results? Estradiol, free testosterone, etc.
High LH indicates your brain wants your testosterone higher, yet your nuts aren’t responding to the increased signal. Or maybe those values are normal for you.
455 total T isn’t bad. I’ve had mine checked twice, several years apart. Both times it was around 320-340 (280 to whatever reference range), with free T also in the bottom part of its range. LH was also on the lower end. Estradiol was within reference, but high considering the low testosterone. Prolactin was fine. TSH was high on the first test at 4+ and fine the next at 1.something. Relatively high estrogen may be at least partly responsible for my testosterone being low, thus my interest in anti-estrogen and aromatase inhibiting substances. More likely is a sluggish hypothalamus and/or pituitary. I suspect TRT is in my future.
I’d like to try a cycle of testosterone to see if I feel any different/better. Not a lot, just enough to boost my T to 800-1000 for a few months. Include some regular low doses of HCG. Also an aromatase inhibitor if estrogen gets out of hand. Too bad the only legal way to do this is to find a doctor who is good with TRT and then pay him way more than I can afford, including a bunch of tests showing what I already know. I haven’t gone the illegal route, though I admit at times I’m tempted.
Being 18 (correct?) with a free T of 450ish, you shouldn’t even be considering TRT. I don’t know if LH on the high end portends anything for your future or not. The forum I linked above would be a good place to ask. Be sure to include your health history. I don’t have time to search, but IIRC you posted in another thread about having a relatively rare condition. Maybe I’m confusing you with someone else.
If your testosterone and estrogen are good, tests on LH/FSH, estradiol, prolactin, etc. are nice, but don’t really accomplish much. These extra tests are useful in determining why testosterone is out of whack. For example, high prolactin could indicate a prolactinoma, warranting further tests. If estrogen is way high, excessive aromatization could be the problem.
If testosterone is low and other causes have been ruled out, then something in the HPTA isn’t working. Failure breaks down into 2 categories. Primary testicular failure is where the testicles are receiving sufficient signal to produce testosterone (via LH) but aren’t responding. The nuts themselves aren’t working.
Secondary failure is where the nuts are ok but the signal mechanism is malfunctioning. The brain for whatever reason doesn’t ramp things up when it should. The hypothalamus secretes GnRH which causes the pituitary to produce LH and FSH. LH and FSH are the “signal” to the testicles to make testosterone and sperm.
LH results are similar to TSH (thyroid) results in that they are both a gauge of the state of the feedback mechanism in their systems. Low numbers indicate the body is satisfied with the current level of hormones. High numbers indicate it is saying, “Make more, we’re too low.”