One example of how stress interferes with fertility: Luteal Phase Defect (LPD) is a well-known problem that often causes failure to conceive by healthy women. It is known to be due to the failure to produce the dominant follicle. The Ovulona detects this by the absence of the pre-ovulatory peaks (where the long-term predictive peak is driven by the maturation of the dominant follicle). Until now, the LPD condition could only be detected too late, by the distortion in the BBT temperature profile, which in LPD exhibits a collapse instead of the usual elevated temperature plateau, normally observed after ovulation. Ovulona’s diagnostic power will save fertility treatment money. This cannot be matched by ovulation kits or by any other such product.