Testosterone threshold-does one size fit all?

Numerous studies have sought to examine the relationship between hypogonadal symptoms and total serum testosterone levels in men in order to identify a threshold at which symptoms occur and at which treatment is beneficial. However, the search for a discrete threshold may be futile given emerging evidence. Recent studies suggest that testosterone threshold varies by symptoms and among individuals. In addition, thresholds may vary between young and old men. Therefore, initiation of treatment should rely more on symptoms and less on a discrete numerical threshold.