Abstract Androstenedione (Δ), Testosterone (T) and Dihydrotestosterone (DHT) have been
measured by radioimmunoassay in spermatic venous plasma from 38 men aged from 17 to …

SUMMARY Δ 4 and Δ 5 androgens were measured in spermatic venous blood of 25
subjects (age range 20–70) during surgical intervention for hernia repair. All androgens …

Measurements of testosterone concentrations in peripheral and spermatic venous blood
have yielded conflicting results concerning testosterone production in elderly men. To further …

Testosterone and androstenedione concentrations in the plasma and testis of male guinea-
pigs were estimated by gas chromatography at intervals (36 stages) from birth to death. Four …

Testosterone and the testosterone precursors pregnenolone, progesterone, 17α-
hydroxyprogesterone, 17α-hydroxypregnenolone, androstenedione, androstenediol and …

Publisher Summary This chapter discusses gonadotropins and plasma testosterone in
senescence. An investigation described in the chapter showed that the testis was capable of …

In order to investigate their pattern of change with age, free testosterone concentration
(FTC), testosterone (T), androstenedione (A) and testosterone-estrogenbinding globulin …

To determine the basis for the decline in testosterone production by the aged testis,
intratesticular unconjugated steroids, including testosterone, pregnenolone (3β-hydroxy-5 …

The secretion of androgens and estrogens by normal and abnormal testes was compared by
determining the concentrations of dehydroepiandrosterone (DHEA), androstenedione (Δ4A) …

Abstract Plasma cortisol, 17-hydroxyprogesterone (17-OH-P), testosterone (T), 5α-
dihydrotestosterone (DHT, estrone (E 1) and estradiol (E 2), were measured in 94 normal …