John, aged 57 years, is a longstanding patient of your general practice. He consults you today about his ‘flagging sex drive’ and wonders if his testosterone level is low. He has seen and heard the advertisements in the media on testosterone and wants his testosterone levels tested. John is CEO of a large company and works long hours. He has no children, by choice, and is currently in a new relationship. He is a lifelong nonsmoker, social drinker and takes no medications. He is of a normal weight and is fit, as he exercises regularly. He has had no significant illnesses.

Picture credit: © PANc0971/iStockphoto. Model used for illustrative purposes only.