Case-based learning: testosterone deficiency

Testosterone deficiency (TD) syndrome in men, otherwise known as male hypogonadism, is a common endocrine disorder defined by the International Society for Study of the Ageing Male, European Association of Urology, International Society for Sexual Medicine and British Society of Sexual Medicine (BSSM) as “a biochemical syndrome associated with advancing age and characterised by a deficiency in serum androgen levels with or without a decreased genomic sensitivity to androgens”​[1–4]​.