Determinants of serum total and free testosterone levels in women over the age of 65 years

Anne R. Cappola, Sarah J. Ratcliffe, Shalender Bhasin, Marc R. Blackman, Jane Cauley, John Robbins, Joseph M. Zmuda, Tamara Harris, Linda P. Fried

Research output: Contribution to journalArticle

Abstract

Context: Little is known about testosterone (T) levels and their determinants in women of late postmenopausal age. Objective: We describe levels of total and free T and selected factors that influence these levels in a random sample of older women. Design: Levels of serum total T and free T by microdialysis were measured using ultrasensitive assays in 347 community-dwelling women aged 65-98 yr enrolled in the Cardiovascular Health Study. Cross-sectional analyses were performed to define factors associated with total and free T levels. Results: In adjusted models: 1) total T levels declined with age until 80, whereas free T levels did not vary by age; 2) women with bilateral oophorectomy had 23% lower total T and 16% lower free T levels than those with at least one intact ovary; 3) oral estrogen users had total and free T levels that were 47% lower than never users; 4) obese women had 47% higher total T and 20% higher free T levels, and overweight women had 24% higher total T and 14% higher free T levels, than normal weight women; and 5) free T levels were 51% higher in black women. Corticosteroid users had 75% lower total T and 43% lower free T levels than nonusers. Conclusions: Bilateral oophorectomy, estrogen use, corticosteroid use, and low body mass index are independent risk factors for lower T levels in women aged 65 yr and over. Although highly prevalent in women of this age, the physiological significance of low T levels in late postmenopausal women requires further investigation.

Original languageEnglish (US)
Pages (from-to)509-516
Number of pages8
JournalJournal of Clinical Endocrinology and Metabolism
Volume92
Issue number2
DOIs
StatePublished - Feb 2007

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

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