One of the most exciting developments in women’s health over the past few years is the emergence of saliva-based testing for endometriosis. For decades, diagnosing endometriosis has been frustratingly slow. The average woman waits 7-10 years from the onset of symptoms to receive a diagnosis. Many are told their painful periods are “normal,” while others undergo years of imaging, medications, or even surgery before finally getting answers. (The Guardian)
Could a simple saliva test help change that?
How does the test work?
Unlike traditional blood tests, the new saliva test (known as Endotest) doesn’t look for hormones or inflammatory markers. Instead, it analyzes microRNAs (miRNAs)—tiny molecules that help regulate gene expression throughout the body. Women with endometriosis appear to have a distinct salivary microRNA “fingerprint” that can be detected using next-generation sequencing and artificial intelligence. (PubMed)
Think of it as looking for the body’s molecular signature rather than trying to visualize the disease itself.
How accurate is it?
The results are encouraging.
A large multicenter validation study involving nearly 1,000 women with suspected endometriosis reported:
- Sensitivity: 97%
- Specificity: 94%
- Overall diagnostic accuracy: approximately 97% (PubMed)
These numbers are remarkably strong for a non-invasive diagnostic test.
Does this replace laparoscopy?
Not yet.
While the technology is incredibly promising, experts currently view the saliva test as an adjunct to clinical evaluation—not a replacement for a thorough history, pelvic examination, imaging, or, when necessary, laparoscopy.
The United Kingdom’s National Institute for Health and Care Excellence (NICE) recently recommended introducing the saliva test into the NHS through a three-year implementation program while additional real-world data are collected. This is an exciting step forward, but it also reflects the need for continued validation before widespread adoption. (The Guardian)
Why I'm excited
As a Functional Medicine practitioner, I spend a great deal of time listening to women who have spent years searching for answers.
Many have:
- debilitating menstrual pain,
- painful intercourse,
- chronic pelvic pain,
- infertility,
- digestive symptoms,
- fatigue,
- or inflammation that has never been fully explained.
A non-invasive test that may help identify women earlier has the potential to shorten years of uncertainty and allow treatment to begin sooner. Earlier diagnosis can also help preserve fertility, reduce unnecessary suffering, and validate symptoms that too many women have been told to simply “live with.”
My perspective
I believe this represents one of the most exciting innovations in women’s health diagnostics in years. At the same time, it’s important to remember that no laboratory test should replace thoughtful clinical medicine. Endometriosis is a complex disease, and diagnosis should always incorporate a patient’s symptoms, physical examination, imaging findings, and overall clinical picture. The saliva test is best viewed as another powerful tool in our diagnostic toolbox—one that may help identify women who previously would have gone years without answers. As more studies emerge and access expands beyond Europe, I suspect this technology will become an increasingly important part of endometriosis care.
I think this is analogous to where cell-free DNA testing (NIPT) was in prenatal medicine about a decade ago: initially viewed as an adjunct rather than a replacement for existing diagnostics, but with the potential to meaningfully change clinical practice as evidence accumulated. Time will tell whether salivary microRNA testing follows a similar trajectory, but the early data are certainly encouraging.
References
- Bendifallah S, et al. Validation of a Saliva Micro-RNA Signature for Endometriosis. NEJM Evidence. 2025. (PubMed)
- NICE (UK). Draft guidance supporting implementation of Endotest and EndoSure for suspected endometriosis within the NHS. 2026. (The Guardian)
- Ziwig Endotest: Technology overview and clinical application. (Endotest.ie)