Estrone-3-Glucuronide (E1G)
Estrone-3-glucuronide is the form estrogen takes in urine once the body has processed it. Papers write it as E1G, E3G or E13G. Because it reaches the urine, a home test can follow the estrogen rise before ovulation.
In 283 cycles dated by ultrasound, the signal began three to four days before ovulation.1 A woman sees that same rise as fertile-type mucus. Monitors read the hormone in perimenopause too. Those cycles showed fast rises, or low levels throughout.2
These monitors have not yet been tested against ovulation confirmed by ultrasound.1
Cited in this entry
- Bouchard T, Abdullah S, Leiva R, Ecochard R. Menstrual Cycle Heat Maps: Visualising menstrual cycle variability using hormone heat map arrays referenced to the ultrasound day of ovulation. Journal of Restorative Reproductive Medicine. 2025. https://doi.org/10.63264/qk8aw674
- Meyers M, Fehring RJ, Schneider M. Case Reports from Women Using a Quantitative Hormone Monitor to Track the Perimenopause Transition. Medicina (Kaunas, Lithuania). 2023. https://pubmed.ncbi.nlm.nih.gov/37893460/
This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.
