78 citations,
November 2008 in “Fertility and Sterility” Amenorrhea is relatively rare and initial testing should check FSH, TSH, and prolactin levels.
38 citations,
October 2006 in “Fertility and Sterility” The document concludes that identifying the cause of amenorrhea is crucial for proper treatment.
21 citations,
September 2004 in “Fertility and Sterility” Amenorrhea, or the absence of periods, should be evaluated by age 15 or within five years of early breast development, and is most commonly caused by conditions like polycystic ovary syndrome and hypothalamic amenorrhea.
30 citations,
July 2004 in “Fertility and Sterility” Amenorrhea is when a woman doesn't have periods, with primary amenorrhea starting by age 15 or within five years of breast development, and secondary amenorrhea when periods stop for three months. It affects 3-4% of women not pregnant, breastfeeding, or in menopause, mainly due to polycystic ovary syndrome, hypothalamic amenorrhea, hyperprolactinemia, and ovarian failure.
21 citations,
December 2019 in “PloS one” The rat model showed early perimenopause with regular cycles and low hormones, and late perimenopause with irregular cycles and higher hormone levels.