Relation of Sex and Estrogen Therapy to Serum Fibroblast Growth Factor 23, Serum Phosphorus, and Urine Phosphorus: The Heart and Soul Study

Older women who are not using estrogen have higher FGF-23 levels than either men or women using estrogen. In the context of prior literature, these data suggest that postmenopausal phosphorus retention may stimulate higher FGF-23 concentrations after menopause.