Testosterone Replacement Therapy: Who Is It For?

A single low testosterone result is a reason to investigate further, not a diagnosis on its own. Levels fluctuate, and biochemical confirmation typically involves more than one measurement, read alongside symptoms rather than in isolation.

Fatigue, low libido and reduced performance can have many causes besides testosterone deficiency. Candidacy depends on these symptoms genuinely aligning with confirmed low levels — not the presence of tiredness alone alongside a borderline number.

Untreated sleep apnoea, obesity, thyroid dysfunction and certain medications can all lower testosterone or produce similar symptoms. Where one of these is present and unaddressed, it is generally considered before treatment — because addressing it may change the picture entirely.

Men actively planning to conceive without a fertility discussion first, those with a significant unaddressed contributing condition, and men seeking treatment purely for bodybuilding or performance enhancement without confirmed deficiency are generally not appropriate candidates at that point — though circumstances can change once the relevant factor is addressed.

Ultimately, whether TRT is appropriate is an individual decision made after the full picture — symptoms, repeat biochemistry, and contributing factors — has been assessed together, not a decision made from a single number.