HCG

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Early beta-hCG readings after IVF embryo transfer may not reliably predict whether a pregnancy will result in a live birth, leaving clinicians without a clear cutoff for counseling patients.

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CDK5RAP3 turns out to be a key protein that helps Leydig cells produce testosterone in response to hCG, and its loss leads to low testosterone in mice. These findings point to a possible cause of male infertility when testosterone is low and could inform future treatments.

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Progesterone measured on the day of the pregnancy test strongly predicts whether a frozen embryo transfer will succeed, with higher levels linked to better outcomes. Checking progesterone at this stage and adjusting luteal support could help improve success rates in fertility treatment.

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Low PAPP-A in the first trimester of twin pregnancies may signal a higher chance of pregnancy complications, but evidence in twins is still limited. The work aims to clarify whether this biomarker can guide care for twin pregnancies as it does for singletons.

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A 20-year-old decision tree for predicting success of watchful waiting in tubal ectopic pregnancy was updated using newer data. The revised model helps clinicians counsel women on whether expectant management is likely to work without surgery.

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Positive hCG results in non-pregnant patients without cancer can lead to unnecessary procedures and even chemotherapy if not interpreted carefully. Clinicians should follow a clear process to rule out pregnancy and cancer before pursuing invasive workup or treatment.

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A rare case of a bone tumor in the jaw that secreted beta-hCG is described, along with a review of similar cases. Such hormone-secreting variants are uncommon and can complicate diagnosis when they appear in unusual sites.

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Clinical factors and hormone levels influence how often egg retrieval succeeds in modified natural cycle IVF. Understanding these relationships could help refine protocols and improve outcomes for patients using minimal stimulation.

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hCG primes the uterine lining for implantation through multiple pathways, affecting immune cells, blood vessels, and tissue remodeling in a coordinated way. The mixed results of clinical trials likely reflect differences in dose, timing, and patient selection, which this molecular view helps explain.

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Using markers like p57 and beta-hCG alongside standard microscopy improves accuracy when distinguishing complete moles, partial moles, and non-molar pregnancies. Combining histology, immunohistochemistry, and genetic testing reduces misclassification and supports better treatment decisions.

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LH and hCG drive egg maturation and ovulation by changing histone marks in granulosa cells, which in turn reshape gene activity. Blocking these changes in rats confirms that this mechanism is essential for ovulation, advancing understanding of how fertility drugs work at the molecular level.

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Different ovulation induction protocols were compared in IVF cycles using donor sperm to see which led to better pregnancy rates. The results offer guidance for choosing protocols in this patient group.

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A rare case describes a mother and infant both diagnosed with metastatic gestational trophoblastic disease, with the infant dying before treatment. The report stresses checking beta-hCG early in infants with unusual liver and lung findings when the mother recently had a pregnancy.

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A step-down FSH protocol was developed to improve egg collection in microminipigs, a smaller pig model used in research. The approach could make long-term studies more practical than using full-sized pigs.

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Progesterone levels on the day of the hCG trigger, and their ratio to baseline progesterone, were analyzed for their effect on pregnancy in fresh IVF cycles. The findings help clarify how late follicular progesterone influences success in antagonist protocols.

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In dairy cows, giving injectable progesterone three days after artificial insemination boosted pregnancy rates, while hCG alone did not. The benefit of progesterone depended on farm and season, suggesting management and environment matter for fertility interventions.

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In PCOS patients, GnRHa triggering yielded more eggs and embryos than hCG triggering, but pregnancy rates were similar when embryo quality was comparable. GnRHa may lower OHSS risk while maintaining outcomes, supporting tailored trigger choice based on patient risk.

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At high altitude, normal adaptations like faster heart rate and breathing can mask signs of bleeding from a ruptured ectopic pregnancy, especially when beta-hCG is low. Clinicians should consider ectopic pregnancy in travelers with pelvic pain even when hormone levels are not clearly elevated.

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Choosing the right trigger for egg maturation in IVF—hCG, GnRHa, dual trigger, or kisspeptin—depends on patient risk and goals, with hCG still most common but carrying OHSS risk. More trials are needed to clarify which strategy best improves live birth and for whom.

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A 51-year-old woman with a molar pregnancy developed hemorrhagic shock and required emergency hysterectomy, then chemotherapy. The case highlights that gestational trophoblastic disease can occur around menopause and that prompt recognition and treatment are essential to avoid life-threatening complications.

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IMG-A1 is a new lab-grown granulosa cell line that responds to FSH but not LH/hCG, mimicking early follicle cells. It offers a useful tool for studying ovarian biology and testing drugs without relying on tumor-derived or short-lived primary cells.

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IL-11 levels in the blood may help diagnose and predict outcomes in oral cancer linked to submucous fibrosis, which behaves differently from other oral cancers. The work explores whether this marker could guide treatment decisions.

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When ovaries respond slowly to fertility drugs, the trade-off between continuing or canceling the cycle was evaluated, along with effects on embryo quality and pregnancy. The findings help clinicians decide how to manage slow responders in PCOS.

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Three postmenopausal women with non-gestational choriocarcinoma—a rare cancer that can occur without pregnancy—are described, with two dying from the disease. The report stresses considering this diagnosis in older women with elevated beta-hCG and no recent pregnancy, and the need for early tissue confirmation.

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A cervical pregnancy with placenta accreta—where the embryo implants in the cervix and the placenta grows into the wall—is reported, along with a review of the literature. The case illustrates the diagnostic and treatment challenges when the pregnancy is large and symptoms are atypical.

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Two hormone regimens for poor ovarian responders—r-hFSH alfa plus r-LH versus r-hFSH delta plus hMG—were compared, filling a gap in head-to-head data for this challenging patient group. The results inform protocol selection when egg yield is limited.

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Dual triggering with GnRHa plus hCG may be preferred for most IVF antagonist cycles, with the ORPI index guiding whether to reduce the hCG dose. When using GnRHa alone with low-dose hCG rescue, freezing all embryos remains an important option to consider.

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Progesterone levels on the hCG trigger day in long-protocol IVF were evaluated for their impact on pregnancy. The work aims to define a threshold above which elevated progesterone may harm endometrial receptivity and outcomes.

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In rats with experimentally induced ovarian hyperstimulation syndrome, melatonin reduced ovarian damage, lowered inflammatory markers, and improved follicle health. These findings suggest melatonin might one day help prevent or treat OHSS in women, though human studies are still needed.

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Vaspin, a protein linked to obesity and metabolism, was found to influence placental hormone production, mostly reducing levels of progesterone, estradiol, hCG, and placental lactogen in lab studies. The results identify vaspin as a new regulator of placental function during pregnancy.