Low Testosterone Incidence in Aging Men

Nelson Vergel

Founder, ExcelMale.com
Prevalence estimates of late-onset hypogonadism (or aging related low testosterone) (LOH) vary widely depending on study methods, populations and diagnostic criteria used. The laboratory diagnosis of LOH, including guideline recommendations, has been reviewed elsewhere [Matsumoto, 2003; Wang et al. 2008; Basaria, 2014]. Importantly, the inclusion of symptoms in the diagnosis of LOH helps to separate the pathologic condition of LOH from normal, and expected, age-dependent declines in testosterone (Figure 1). For instance, in the Hypogonadism in Males (HIM) study, 38.7% of men over 45 years met criteria for androgen deficiency, defined as a morning total serum testosterone of <10.4 nmol/l (300 ng/dl) [Mulligan et al. 2006]. In contrast, in the European Male Aging Study (EMAS), using criteria of testosterone <11.1 nmol/l (320 ng/dl) combined with the presence of symptoms, an estimated 2.1% of men aged 40&#8211;79 years met these criteria [Wu et al. 2010]. As expected, the prevalence of LOH in EMAS increased with age, from 0.1% for men in their 40s to 5.1% for men in their 70s [Wu et al. 2010]. Using both laboratory and symptoms for diagnosis, the Massachusetts Male Aging Study estimated that 2.4 million US men met criteria for LOH [Araujo et al. 2004].

low T symptoms graph.webp

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4647137/
 

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Understanding Your Hormones

Estradiol (E2)

A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

DHT

Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth, prostate health, and masculinization effects.

Free Testosterone

The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.

Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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