Reliability and Interrelations among Serum Sex Hormones in Postmenopausal Women

The authors evaluated the short-term (4-week) and long-term (2-year) reliability of serum sex hormones and interrelations among serum sex hormones in white postmenopausal women. For comparison, they simultaneously evaluated the short- and long-term reliability of other commonly measured risk factors, i.e., lipids, lipoproteins, and blood pressure. Serum concentrations of estrone, estradiol, testosterone, and androstenedione were measured by extraction, column chromatography, and radioimmunoassay