| http://www.w3.org/ns/prov#value | - symptoms or signs of hypogonadism such as decreased libido, bilateral testicular atrophy or a reduced amount of body hair.9 The prolactin level should be measured if the free testosterone level is low, the patient has a substantial loss of libido or a prolactinoma is suspected on the basis of a history of headache with visual field cuts.10 Measurement of luteinizing hormone levels can be reserved
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