The rate of disappearance of intravenously injected LH-RH was studied in 6 human volunteers. The blood samples were taken every 20 sec from the time of injection to time +5 min and every 30 sec from time +5 min to time +10 min. The half-life of LH-RH was calculated in the interval of 3-10 min, and was found to be 2.4 +/- 0.4 min. The amounts of LH-RH estimated in the vascular compartment were relatively low when compared to the total amount of injected LH-RH. This observation suggests a rapid and important passage towards the extravascular compartment.
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