The Mira fertility device DOES NOT WORK for tracking LH the way if you're doing IVF. My clinic is far from where I live, so I do outside monitoring at a local 5-star university clinic. Up until this week, they would not test LH for outside monitoring patients, so I was using the Mira for an LH reading. Last week, the device said my LH was 20+ which led my clinic to believe that I would ovulate before I got there, so we'd have to forego this cycle. This week (7 days later), Mira said my LH was 4.6 or undetectable. When I got to my monitoring appointment, I found out that the clinic can do LH now, so they did a blood draw an hour after I took the Mira reading and tested the LH. MY LH WAS ACTUALLY 26.....DEFINITELY NOT 4.6. The same follicle from last week was still there...and now, was actually about to ovulate and I definitely couldn't get to my home clinic in time. So last week's 20+ reading on the Mira device, which was probably wildly off given what I discovered this week about its readings, screwed me out of a retrieval - which at my age I can't afford. In short: the device said my LH was 4.6, a blood test within 45m showed it was actually 26. DO NOT RELY ON THIS DEVICE IF YOU'RE SPENDING THOUSANDS OF DOLLARS ON IVF, BECAUSE IT'S NOT JUST A LITTLE INACCURATE, IT'S 100% INACCURATE.