It taeks LH at least 4 hours to metabolize in the urine after waking to give a correct result. I woke at 6 and waited two hours to drink anything before and took it at 10:00 then if you ahve a fast surge you can miss it and sometimes if I thought it was about to be dark I took it again at 8:00pm, per RE instructions. When you get that positive then stop checkin. The egg will live for only 12 hours and the egg can release anywhere from 0-24 hours after you test. Your basal temp will go up .5 degrees above coverline to say for sure you have O'd.
10_07 you put second day urine??? what does this mean?
My RE's protocol is to use the 2nd day urine, and to test between 10am and 2pm.
Thanks amyj77 on the next cycle will try that 10am seems a lot more 'do-able' than 2pm!
They say there is a window. But I tested usually around 10 a.m., sometimes the first urine, sometimes the second. I came up positive and I double checked during the day...but my surge seems to go away by 2 or 3 p.m. A lot of surges happen at night for me...everyone is different. I think they normally say between 10 and 5.