DOI: 10.1373/clinchem.2016.265124

A 69-year-old man was referred to the endocrine clinic with a 3-year history of erectile dysfunction, reduced libido, and lack of nocturnal tumescence with no response to phosphodiesterase type 5 inhibitors (sildenafil and tadalafil). The symptoms troubled him to such an extent that he asked his general practitioner to be referred to a specialist clinic.