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Isolated follicle-stimulating hormone deficiency in man
Fertility and Sterility
|August 1, 1977
Summary
This study reports two men with low follicle-stimulating hormone (FSH) and normal other hormones. Results suggest a potential defect above the pituitary gland affecting FSH production in male infertility.
Area of Science:
- Endocrinology
- Reproductive Medicine
- Male Infertility
Background:
- Assessing male hypogonadism requires evaluating multiple pituitary hormones.
- Follicle-stimulating hormone (FSH) plays a crucial role in spermatogenesis.
Observation:
- Two male patients presented with persistently low serum FSH (<3 mIU/ml) but normal luteinizing hormone (LH) and other pituitary hormones.
- Thyrotropin-releasing hormone (TRH) stimulation elicited normal TSH and prolactin responses.
- Gonadotropin-releasing hormone (GnRH) stimulation showed a blunted FSH increase but a significant LH rise.
Findings:
- Clomiphene administration normalized FSH in both patients and stimulated LH and testosterone in one.
- These hormonal responses suggest a potential defect in FSH regulation originating above the pituitary gland.
- Semen analysis revealed impaired sperm motility and morphology, with testicular biopsy showing delayed spermatogenesis.
Implications:
- Serum FSH measurement is recommended for male infertility investigations.
- Understanding central regulatory defects is crucial for diagnosing and managing male reproductive disorders.
- Further research into hypothalamic-pituitary axis dysfunction in male infertility is warranted.