PLASMA UNCONJUGATED 15α‐HYDROXYOESTRIOL (OESTETROL) LEVELS IN NORMAL HUMAN PREGNANCY

Abstract
Serial measurements were made of the concentration of plasma unconjugated oestetrol in normal human pregnancy. The mean curve and limits of normal variation have been established. Plasma levels rose from just below 2 ng/ml at 20 weeks to approximately 5 ng/ml at term.