I believe the line must be darker than the control line to be positive since there is always some circulating LH in our systems.
how can i know if an ovulation kit tells me if i am pregnant...do it needs to show 2 lines or do one line need to be darker than the other..i am very confuse..can someone please explain to me how can i use an opk as a hpt and how can i tell if it shows early pregnancy.thank you and god bless..baby dust to all..
Good information. I have wondered the same thing myself. Thanks.
According to www.peeonastick.com you can. I am cutting and pasting:
Overall-- yes, it can be done. Ovulation predictor tests (known as OPK's because they are normally sold in a set of tests known as a "kit," thus the K) will show a positive result when a woman is pregnant, as well as when she's ovulating.
Specifically-- while it works most of the time, there are good reasons to avoid using an OPK as an HPT for diagnostic purposes. If you want to pee on any stick that will stand still after you know you're pregnant, just for fun, have at it. But I would not recommend using an OPK in place of an HPT overall.
Reasoning-- OPK's detect LH (luteinizing hormone) which is the hormone associated with ovulation. Pregnancy tests detect hCG, the hormone associated with pregnancy. LH and hCG are, at a molecular level, nearly identical. hCG has a beta subunit, meaning it has an extra little "doodad." To use a stupid but easy to understand example, LH and hCG are identical twins, except that hCG wears a funny hat.