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Just remember if they do it at 36 hours the eggs can still be fertilized for up to 12 hours after ovulation. My fertility dr did iuis 36 hrs after trigger. Mine were unsuccessful but that's because my tubes were cut and burned then reversed. Best of luck to you though and God bless! My best friend just had success on her 3rd iui round! ;-)

Once the follicles are mature, at least 18 mm in size, 10,000 IU of hCG is given to trigger ovulation. This will start the process of ovulation, or the release of the egg(s), predictively and very accurately, in about 38 hours. In human females, the process to actually release the egg takes about 4 hours. Therefore, 38 plus 4 equals 42, which is about the time the egg(s) will physically be released and picked up by the fallopian tube.

Info given on internet. This time I will try 40 hrs later. Hoping for positive.