to determine the mechanism of amenorrhea , we measured the immunoreactive serum luteinizing hormone ( lh ) and follicle-stimulating hormone ( fsh ) , and plasma estradiol ( e2 ) before and after intravenous administration of luteinizing hormone-releasing hormone ( lh-rh ) in 11 unselected premenopausal patients who developed amenorrhea and 11 unselected patients who did not .
C0229671
serum
C0032105
plasma