with the use of a specific antiserum to hcg beta-subunit , significant increases in circulating hcg were observed by day 8 following the luteinizing hormone ( lh ) peak in 5.3 % of cycles . by day 9 in 15.8 % , by day 10 in 53.2 % , and by day 11 in 100 % of the cycles resulting in a normal pregnancy .
C0106132
hcg
C0018062
hcg