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Information regarding HCG injection - Online Doctor Chats

Date : 21-Feb-2012
User rating for this question
Average Posted in: Getting Pregnant
Answered by

General & Family Physician
Practicing since : 2004
Answered : 1722 Questions
User :   I have a time sensitive question about LH surge vs. HCG injection.
Doctor :   hello
Doctor :   tell me your query
User :   Hi, I am doing IUI this month on a clomid medicated cycle
User :   one moment...
Doctor :   ok
User :   Ultrasound CD 11, dr. says eggs aren't quite ready yet. INstructions were to Trigger on evening CD 13
User :   CD 12 I get my natural LH surge, called the Dr.- Dr. says to believe the ultrasound and take the Novarel as scheduled
User :   I am wondering if the Novarel will "override" my natural LH surge.
User :   BEcause I am confused as to why he would tell me to go as scheudled
User :   scheduled*
Doctor :   may i know your age please
User :   33
User :   as far as I know, clomid doesn't affect OPK's unless you take them too close to the days you were taking the medication, so I'm not sure why he didn't have me trigger on the night I got my surge
User :   His explanation was that he would rather believe the ultrasound, but I am afraid I will ovulate early- UNLESS- the HCG injection overrides my natural surge
Doctor :   how did you get to know about the LH surge
User :   I've been charting for years.
User :   I knew about my LH surge because I was taking OPK
User :   if that's what you mean
Doctor :   thats is not completely accurate indication, but an ultrasound with HCG is more sensitive
Doctor :   thats why we go by that
User :   I've read that, but I still need to know if the HCG shot overrides my natural LH surge. Because, if I am surging early (for whatever reason) I will ovulate before my IUI.
User :   Basically, if I ovulate today before midnight, there is no reason for me to do the IUI.
Doctor :   do not worry since you are under ultrasound cover so it can be easily made out
User :   What can be easily made out? I need to know- does the HCG shot postpone ovulation
User :   If you don't know, please refund my money
Doctor :   HCG causes ovulation
User :   I know this.
Doctor :   not postpones it
Doctor :   you just asked me if it does
User :   I know that- but if I am already having my LH surge, I need to know if I will still ovulate 36-40 hours after the shot- REGARDLESS of when my LH surge started naturally
User :   That is what I mean by postponing it
User :   I understand that it brings on ovulation, but do I go by when my natural surge started, or does the shot automatically make me ovulate 36-40 hours after I take it, regardless of when my natural surge started
Doctor :   your LH surge charting is not accurtate method unless confirmed by lab results . hence depending on LH surge for ovulation by your method would not be appropriate thats why your doc told you so
Doctor :   it will make you ovulate
Doctor :   independent of LH surge
Doctor :   HCG is more powerful ovulation stimulus
User :   I understand that it will make me ovulate. I don't think you are understanding what I'm saying. I will try to ask a different way. Let's say that my LH surge is a true surge. Will I ovulate 36-40 hours after taking the shot, regardless of whether or not I have already started to surge.
Doctor :   yes
Doctor :   you will
User :   In that case, you are saying that the HCG shot DOES override a natural LH surge
User :   yes?
Doctor :   yes
Doctor :   thats correct
User :   Ok thank you
User :   I was worried that once I took the shot, I would still ovulate earlier than 36-40 hours
Doctor :   your welcome
Doctor :   dont worry
User :   okay thanks. We are scheduled for IUI tomorrow morning and I feel better about paying for it now.
Doctor :   ok
Doctor :   take care good bye
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