3 citations
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February 2018 in “Human Reproduction” A man with testotoxicosis was fertile despite low FSH levels, suggesting high testosterone may allow sperm production without FSH.
January 2013 in “Journal of Endocrinology and Diabetes Mellitus” Cushing syndrome often causes low testosterone and sexual issues in men.
30 citations
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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.
78 citations
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November 2008 in “Fertility and Sterility” Amenorrhea is relatively rare and initial testing should check FSH, TSH, and prolactin levels.
38 citations
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October 2006 in “Fertility and Sterility” The document concludes that identifying the cause of amenorrhea is crucial for proper treatment.