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So essentially, there is no standardization in how they determine their ranges. Whether it's based on statistical models of patients results, or if they use a "healthy" sample group?

I've noticed things like testosterone and E2 ranges vary significantly, while HGB or HCT never change. I always thought it was due to different methodology such as ECLIA vs LC/MS/MS. For example the standard vs sensitive E2 test.

Does that mean 400ng/dl on a 250-850 range is the same as 400 on a 348-1197 range assuming the same methodology?

I think part of the confusion is that "normal" refers to the statistical normal, as opposed to the colloquial "normal" meaning of the word. Correct me if I am wrong on anything here.