I do know...I went threw this last cycle..
I called my pharmacy and asked how long ovidrel 250 mcg stays in your system, and here is what he said:
It has the half life of 29.2 hours, so that means this:
29.5 hours from the injection it is 50% out of the body, then every 29.5 hours, that amount is cut in half, he gave me all the figures:
-50% out
-75% out
-87.5% out
-93.75% out which he said is considered completely out.
So here is what I calculated for myself last cycle:
3/26 - 7:30 am injection
3/27 - 1:30 pm 50% out, 50% left
3/28 - 7:30 pm 75% out, 25% left
3/30 - 1:30 am 87.5% out, 12.5% left
3/31 - 7:30 am 93.75% out and 6.25% left
You keep dividing the number by 2 (6.25 / 2 = 3.125%)
and so on...
Hope this helps...
PS it was still in me 10 days later!!!
Thank You!!! I'm going to start calculating now....
Good luck :) just watch out for false positives, I got them and was so disappointed when it was a true BFN :( I hope you have better luck :)