Unexplained Infertility

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 13, 2026

"Unexplained infertility" is a clinical label assigned when standard evaluation, which typically includes semen analysis, ovulation assessment, hormonal screening, and tubal patency testing, returns normal results. It affects an estimated 15 to 25% of couples presenting for infertility care. RRM does not accept this as a final diagnosis. In RRM, unexplained means undiagnosed.

The diagnostic yield of a full RRM evaluation demonstrates why. In one Canadian family practice cohort, unexplained infertility dropped from 40% of presenting patients to 1% after NaProTechnology evaluation.¹ The same evaluation identified low progesterone in 62%, low luteal estrogen in 50%, and anovulation in 14% of patients who had previously been told nothing was wrong.¹ The label persisted because the standard workup did not look for what RRM looks for.

Conditions routinely missed by standard evaluation include luteal phase deficiency detectable only through serial post-peak progesterone profiling, subclinical ovulation disorders visible only on targeted ultrasound, Stage I to II endometriosis (present in up to 47% of women with unexplained infertility who undergo diagnostic laparoscopy),² chronic endometritis, immune dysregulation, and male factor oxidative stress not captured by routine semen analysis.

A comprehensive evaluation through cycle-timed diagnostics is the RRM answer to the unexplained label. The goal is a diagnosis. When the evaluation is thorough, unexplained infertility almost disappears as a category. The question shifts from "why won't it happen?" to "what have we not looked for yet?"

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.