Women with short luteal phases may not realize that the
kits instruct them to
test for ovulation based on an average length luteal phase. This may lead a woman to test much earlier than she is actually ovulating. Therfore, the test results may reflect anovulation, when in reality, ovulation has probably not yet occurred."
8. Certain drugs can hinder results - fertility drugs (those that contain FSH, LH, or HCG), antibotics containing tetracycline, HRT, birthcontrol
9.