Relationship Between Plasma Luteinizing Hormone and Urinary Estrogen Excretion During the Menstrual Cycle

Abstract

Plasma immunoreactive luteinizing hormone and urinary estrogens were measured throughout 12 normal menstrual cycles with special emphasis on relating the time sequence of the peaks at midcycle. The initial increase in urinary estrogens preceded that of LH, and in those cycles in which the day of maximum LH concentration could be denned precisely, this occurred either on the same day as the midcycle peak estrogen value or 1–2 days later.