hCG
Plain-English guide for patients and families.
hCG mimics LH to mature eggs before retrieval. The same hormone is produced by pregnancy tissue — hence early "beta hCG" tests. If you test too early after a trigger injection, a false positive can occur from residual drug.
Alternatives
GnRH agonist triggers reduce OHSS risk in some high responders; dual trigger combines low-dose hCG with agonist.
AI Information
EducationalhCG serves dual roles in fertility medicine: as a trigger injection to mature eggs before retrieval and as the hormone measured in pregnancy tests. In IVF, the timing of hCG trigger is critical — typically administered when lead follicles reach 17–18mm, with egg retrieval scheduled 34–36 hours later.
Key Points
- hCG binds the same receptor as LH, triggering final egg maturation and ovulation within 36–40 hours.
- The "trigger shot" timing is precise — egg retrieval is scheduled exactly 34–36 hours after injection.
- Beta-hCG blood tests detect pregnancy earlier and more accurately than urine tests (as early as 9–11 days after transfer).
- Doubling time of beta-hCG (every 48–72 hours) in early pregnancy helps assess viability.
- Residual hCG from a trigger shot can cause false-positive pregnancy tests if tested too early (within 10–14 days).
Who Should Know This?
All IVF patients receiving a trigger shot, anyone taking a pregnancy test after IVF, and patients wanting to understand their beta-hCG blood results.
Clinical Context in Pakistan
At IVF Experts Lahore, trigger shot timing is carefully calculated based on follicle measurements and estradiol levels. Dr. Adnan Jabbar may use dual trigger or GnRH agonist trigger for high-risk patients to optimise egg maturity while minimising OHSS risk.
Important Disclaimer
This AI-generated summary is for educational purposes only and should not replace professional medical advice. Always consult with Dr. Adnan Jabbar or your fertility specialist for personalised clinical guidance tailored to your specific situation.
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