The changing ratio of bioactive to immunoreactive luteinizing hormone (LH) through puberty principally reflects changing LH radioimmunoassay dose-response characteristics.
Burstein S, Schaff-Blass E, Blass J, Rosenfield RL. The changing ratio of bioactive to immunoreactive luteinizing hormone (LH) through puberty principally reflects changing LH radioimmunoassay dose-response characteristics. J Clin Endocrinol Metab. 1985 Sep; 61(3):508-13.