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Howard R. Nankin, Philip Troen, REPETITIVE LUTEINIZING HORMONE ELEVATIONS IN SERUM OF NORMAL MEN, The Journal of Clinical Endocrinology & Metabolism, Volume 33, Issue 3, 1 September 1971, Pages 558–560, https://doi.org/10.1210/jcem-33-3-558
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Abstract
Serum luteinizing hormone (LH) levels were determined every 15 minutes, between 6:00 a. m. and 6:00 p. m., in four normally active men. Each subject demonstrated a repetitive pattern of abrupt elevations throughout the day. Twenty-one elevations were found during the total of 48 hours of monitoring. In the four volunteers, ratios of the highest to lowest levels of gonadotropin during the 12 hours ranged from 2.1–2.9. Individual or averaged concentrations of LH may not completely characterize pituitary-gonadal relationships.