Serum β-human chorionic gonadotropin profile and its correlations with ultrasound parameters in low-lying-implantation ectopic pregnancy in the first trimester.

This study established the serum β-hCG profile in LLIEP in the first trimester. The exponential increase of β-hCG levels was similar to that of normal intrauterine pregnancies. The β-hCG levels were not associated with placentation complexity of CSP. Higher β-hCG levels did not implicate less success in conservative surgical management.