LH (Luteinizing Hormone)
LH rises sharply right before ovulation. This is called the "LH surge." Typically, an egg is released within 24 to 36 hours after this surge, marking your most fertile time.
That's why LH is a key hormone for predicting ovulation. Tracking LH levels through ovulation tests can be helpful when trying to conceive.
If LH doesn't rise enough or your cycles are irregular, ovulation may not be happening properly.
LH also tends to increase as menopause approaches, since the brain signals the ovaries more strongly when their function declines. LH plays an important role not only around ovulation, but also in overall reproductive health.
P3G (Pregnanediol-3-Glucuronide)
P3G is a urine-based metabolite of progesterone, the hormone that rises after ovulation during the luteal phase.
An increase in P3G indicates that ovulation has occurred and that your luteal phase is progressing as expected.
Tracking P3G helps confirm ovulation and can be useful when monitoring your cycle health or preparing for pregnancy.