Fertility treatments typically involve a combination of FSH and hCG as a substitute for LH.

“So we use hCG for but the body of course doesn't have hCG until the patient's pregnant. Yeah. But it works well to as a substitute for synthetic LH out there as a drug. Yeah. Okay. Yeah. Um so how do you prevent her from ovulating while you are giving her FSH and LH and she is build and she is ripening multiple how are you preventing question there's another medication that we give it's called the G&R antagonist basically blocks the LH surge from happening until I see so when you're giving her FSH the LH that's attached to it is very very low, right? And that will prevent an ovulation. Yes, the antagonist will. Yeah. It's basically blocking the G&RH, which is another hormone.”