| pubmed-article:9679507 | pubmed:abstractText | When menarche has failed to occur or menstrual cycles have stopped, the problem can be traced back to a functional or structural defect in the hypothalamus, pituitary, ovaries, or uterus. In most cases, the history is the principal source of diagnostic information. Necessary laboratory studies include one for the most common cause of amenorrhea: pregnancy. | lld:pubmed |
