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An hCG shot is given 35 hours before an egg retreival for IVF because women *generally* will ovulate 36 hours after the shot is given. The doctor needs to retrieve the eggs used for IVF *just* before ovulation. If the woman ovulates then the retrieval can't be done, and the eggs aren't fully mature enough for retrieval until just before the eggs would ovulate. Hope this helps!

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Q: Why is the Hcg shot given thirty five hrs before an egg retrieval used in fertility?
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