During which gestational age is peak serum HCG levels attained ?
Human chorionic gonadotropin Glycoprotein with alpha and beta chains 3 subunit is specific to hCG Secreted by trophoblastic tissue, some amount by fetal tissues, adult ant pituitary Many isoforms of hCG with variable crossreactivity between various assays More than loo commercial assays Sandwich type immunoassay: Sens - 1 IU/ml Immuno radiometric assays: more Sensitive Ref : Dutta book of obstetrics 8th Ed.
7-9 weeks
11-13 weeks
20 weeks
25 weeks
All India exam