Context: Reference ranges are essential for partitioning testosterone levels into low or
normal and making the diagnosis of androgen deficiency. We established reference ranges …

Background: Reference ranges for testosterone are essential for making a diagnosis of
hypogonadism in men. Objective: To establish harmonized reference ranges for total …

Context: Age-specific estimates of mean testosterone (T) concentrations appear to vary by
year of observation and by birth cohort, and estimates of longitudinal declines in T typically …

The diagnosis of male hypogonadism requires the demonstration of a low serum
testosterone (T) level. We examined serum T levels in pedigreed samples taken from 62 …

Testosterone deficiency has a prevalence of 20% among adolescent and young adult (AYA)
males. Although previous studies have shown that total testosterone (TT) levels are …

Context: Testosterone (T) levels decline with increasing age. Controversy exists over the
threshold for classifying T as low vs. normal in older men. The relevance of assessing …

Context: During aging, total testosterone (TT) declines and SHBG increases, resulting in a
greater decrease in calculated free T (cFT). Currently, guidelines suggest using TT to …

Objective There is little consensus on what androgen levels are 'normal'for healthy, ageing
men. Using data from the Massachusetts Male Ageing Study (MMAS), we estimated age …

OBJECTIVE To determine the prevalence of subnormal testosterone concentrations in
patients with obesity and with type 2 diabetes in a primary care clinic population …

Testosterone levels are used primarily for the diagnosis of hypogonadism in men and
androgen excess in women. Current studies suggest that serum testosterone measurements …