Abstract
Daily measurements of serum oestradiol, progesterone, Schwangerschaftsprotein 1 (SP1) and hCG were made in 13 menstrual cycles during which conception occurred. The assays were continued until 21 d after ovulation. SP1 was detected in maternal blood 8-14 d after ovulation and hCG 9-13 d after ovulation. We conclude that these two proteins are secreted simultaneously but independently by the syncytiotrophoblast.
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