Serum hCG Levels following the Ovulatory Injection: Associations with Patient Weight and Implantation Time

Figure 3

Time to implantation (days) as a function of serum hCG level the morning after 10 000 units ovulatory injection. The mean time to implantation was days (). There was an inverse correlation between implantation time and serum hCG (). A rolling average of the implantation time (red circles) was longer (9–10.5 days) when the postinjection serum hCG levels were lower (~100 mIU/mL) when compared to an implantation time of ~8 days when the postinjection serum hCG levels were higher (250–400 mIU/mL). There was a significant inverse association (regression equation, smooth line) between implantation time and serum hCG level ().