In order to provide a comprehensive account of pituitary‐testicular function in man, 466
subjects, ranging in age from 2 to 101 years, were studied to examine blood levels of the …

The 24-h mean plasma concentrations of androgens (dihydrotestosterone and total and free
testosterone), estrogens (estrone and estradiol), and gonadotropins (LH and FSH) were …

Testicular endocrine function and androgen-dependent secondary sexual characteristics
were assessed in 283 men 18 to 96 years of age. Mean serum total testosterone levels …

Decreased testicular function occurs as a concomitant of aging in men and is accentuated
by the presence of systemic illness. Previous studies identified an intrinsic Leydig cell defect …

The somatic manifestations of puberty in a cohort of 51 boys were correlated with changes in
the concentrations of plasma testosterone, LH, and FSH. The stage of pubertal development …

Testosterone and gonadotropins. Several studies demonstrate that the serum testosterone
concentration declines with increasing age. In one cross-sectional study of 83 healthy men …

Serum FSH, LH and prolactin were measured in fifty‐eight normal males between 30 and 80
years of age. At the same time, similar estimations were performed on samples taken from …

From the Department of Chemical Pathology, St Thomas's Hospital, Lambeth Palace Road,
London SEJ 7EH, UK from the pituitary during the night. 6 In men, this stimulates the …

The normal physiology of the hypothalamic-pituitary-testicular axis in man is reviewed.
According to current concepts, LH plays an important role in the initiation and maintenance …

SUMMARY A radioimmunoassay technique for the simultaneous measurement of eight
unconjugated steroids (progesterone, pregnenolone, dehydroepiandrosterone …