Say you are undergoing IUI or IVF and your doctor has told you that you have a high percentage of immature eggs.
Remember, having a rate of 10-20% of immature eggs is normal.
However, having a high percentage of immature eggs can be a function of a few things. Firstly, maybe you received the hCG too early, and waiting 1-2 more days may have increased the percentage of mature eggs. Most people on average do not have an excess of immature eggs when receiving their hCG shot, once their biggest follicles reach about 18 mm. Some women however, need their biggest follicles to be 20 or 22 mm before most of their eggs are mature.
There is no way to know this in advance of the first cycle. But, if this is the case, changes should be made for subsequent cycles and you should discuss this with your doctor.
There are some women who, no matter how long we wait to give the hCG shot, will still have a large number of immature eggs. We can’t explain why this is so. It is simply a case of dealing with what you have.
In general, we don’t want to wait too long before giving the hCG shot because eggs can become over-mature and this could show up later as poor quality embryos.