The advent of the radioimmunoassay of Beta subunit chorionic gonadotropin (BhCG) has eliminated a major problem in following the patient with gestational trophoblastic neoplasia (GTN). Whole hCG cross reacts with luteinizing hormone (hLH) causing difficulties when GTN patient titers fall to levels coincidental with pituitary levels of hLH. The use of the Beta subunit of hCG in radioimmunoassay ...

JAR malignant trophoblast cells produce a free alpha subunit in addition to an alpha combined with beta subunit as hCG. The free alpha is larger by gel chromatography and SDS-PAGE than combined alpha and is unable to associate with beta subunit to form hCG. A tryptic fragment, representing amino acid residues 36-42, derived from free alpha was larger than the corresponding fragment from combine...

BACKGROUND Although close observation of serum estradiol (E2) levels remains a mainstay of assessing clinical response to controlled ovarian stimulation, the prognostic value of any change in E2 levels after administration of hCG remains unclear. The objective of this study is to evaluate the relationship between serum E2 response after hCG administration and the clinical pregnancy and live bir...

The gonadal receptor for luteinizing hormone LH and chorionic gonadotropin was extracted in soluble form from a particulate binding fraction of the interstitial cells of the rat testis by treatment with the nonionic detergent Triton X-100. During binding studies with the soluble receptor and 12ZI-labeled human chorionic gonadotropin (hCG), receptor-bound and free forms of the hormone were separ...

OBJECTIVE Hyperchromatic crowded groups (HCG), a term first introduced into the cytology literature by DeMay in 1995, are commonly observed in Pap tests and may rarely be associated with serious but difficult to interpret lesions. In this study, we specifically defined HCG as dark crowded cell groups with more than 15 cells which can be identified at 10x screening magnification. METHODS We ev...

OBJECTIVE To determine the average within person biological variability of free-β human chorionic gonadotrophin (free hCGβ), intact hCG and pregnancy-associated plasma protein A (PAPP-A), and to establish analytical goals for the measurement of these markers when used in first trimester screening. METHODS Free hCGβ, PAPP-A and intact hCG were measured on paired first trimester samples collect...

This study was performed to analyze retrospectively outcomes of stimulated in vitro fertilization (IVF) cycles where the gonadotropin-releasing hormone (GnRH) antagonist was omitted on ovulation triggering day. A total of 92 consecutive IVF cycles were included in 65 women who are undergoing ovarian stimulation with recombinant FSH. A GnRH antagonist, cetrorelix 0.25 mg/day, was started when le...

BACKGROUND Although human placenta is a well established, rich source of proteins, hCG is the only measurement available to date in diagnosing the occurrence of the hydatidiform mole. Serum levels of a new placental protein, immunoreactive inhibin, were high in molar pregnancy, but the inhibin assay never became of clinical use, due to its low specificity and reliability. Since specific assays ...

The gonadal receptor for luteinizing hormone LH and chorionic gonadotropin was extracted in soluble form from a particulate binding fraction of the interstitial cells of the rat testis by treatment with the nonionic detergent Triton X-100. During binding studies with the soluble receptor and 12ZI-labeled human chorionic gonadotropin (hCG), receptor-bound and free forms of the hormone were separ...