The present non-interventional study is to document the testosterone levels in patients with clinical symptoms such as loss of sexual desire indicating hypogonadism (testosterone deficiency syndrome). During testosterone replacement therapy with TESTIM®, the changes in the quality of life - especially with respect to motivation, activity and fatigue - of hypogonadal patients will be documented and correlated with the testosterone levels during the course of therapy.

Inclusion Criteria:

• therapeutic need according to SPC
• written informed consent

Exclusion Criteria:

• contraindications according to SPC

Private practices