Can I use Clear Plan Fertility Monitor sticks in the digital HPT (or vice versa)?
Officially: definitely not. Unofficially: well, kinda. They look identical, but they measure different things. The FM sticks measure LH (one line) and estrogen (one line); the HPT sticks measure hCG (and possibly LH.) Incidentally, FM sticks are interesting in that the estrogen line gets lighter as estrogen increases, whereas the LH line gets darker as it increases (as is the case with regular OPK’s and HPT’s.
