The simple answer is that vasectomy reversal will NOT alter testosterone levels. Any statements to that effect, or "evidence" you might come across on the internet are anecdotal. There isn't any clinical evidence to support the hypothesis.

Vasectomy reversal will do the following:

1) allow men to be fertile again (65% - 75% success rate)

2) in cases of photosensitive vaporization of the prostate (PVP) due to back pressure relieve the pain in 70% - 80% of cases.

However, there is a possible indirect way in which reversal might assist in specific situations.

1) If you are suffering PVP and have a reversal that alleviates the pain, then once you become pain-free this will bring about an improvement in mental health, and probably an improvement in physical wellbeing. Indirectly, this general improvement in health may bring about an increase in levels. Depression and general ill-health is known to lower Testosterone levels, and general improvement can help raise them.

2) Not all men are cut out to be sterile, and being sterile can cause depression. As above, restoring fertility would bring about a change in mental and physical wellbeing, and may help Testosterone levels indirectly.

So, if you fit into either of the two scenario's above, then it's just possible that Testosterone levels *might* change as an indirect result, but otherwise it won't help at all.