Dr. Charles Mok argues that testosterone replacement therapy guidelines are too vague about what counts as low. Endocrinologists treat based on symptoms, not just lab numbers, and a large study found many men they treated had testosterone levels in the normal range, suggesting population averages don't always match clinical need.
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The guidelines for what level of testosterone determines which men will benefit are quite vague. So we look at studies comparing different specialists. Doctors had the most expertise in hormone replacement would be endocrinologists. This is a residency that doctors undertake to specialize in hormone replacement therapy and they generally go by symptoms rather than by an absolute level. In fact, a large study showed that the most likely men that had testosterone levels that were considered normal at gap replacement were by endocrinologist because they had symptoms of low testosterone, even though their testosterone was levels were in this so called normal range. Because we know that normal range is not really helpful. It just means that that's where 99% of men fall.