<prompt> Investigation of choice of hyperprolactinemia-TRH estimationLH estimationProlactin estimationEstradiol estimation  <response>: Diagnosis of HyperprolactinemiaHyperprolactinemia is common in young women and plasma prolactin should be measured in women with amenorrhoea whether or not galactorrhoea is present.Diagnosis of hyperprolactinemia is established by measuring fasting morning prolactin level.Hormone secretion is pulsatile and vary widely therefore it is necessary to measure hormone levels on several different occasions.Prolactin level 200 ngml Occur only in prolactinoma100-200 ngml Strongly suggest prolactinoma 100 ngml Due to any cause except prolactin secreting adenoma. 