Estimated Day of Ovulation (EDO)
The estimated day of ovulation (EDO) is the one cycle day marked as the day the egg was most likely released. The estimate comes from fertility charting: mucus, a shift in waking temperature, or a urine hormone reading. An estimate is not proof that an egg was released.
In a 2014 study, women chose their own day in 130 of 147 cycles. The best mucus rule came within three days of a urine monitor in 24 of 26 cycles1. Charts also show what calendar rules miss. Across 714 cycles on a monitor, part of the fertile window fell outside cycle days 8 through 19 in about 24 of every 100 cycles2.
Restorative care reads the cycle in front of it.
Cited in this entry
- Porucznik CA, Cox KJ, Stanford JB, Schliep KC. Pilot test and validation of the peak day method of prospective determination of ovulation against a handheld urine hormone monitor. BMC Women's Health. 2014. https://pubmed.ncbi.nlm.nih.gov/24400707/
- Schneider M, Fehring RJ. Descriptive Statistical Evaluation of the Standard Days Method of Family Planning. The Linacre Quarterly. 2012. https://pubmed.ncbi.nlm.nih.gov/30082989/
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.