Endometriosis test: What a self-test can and cannot do

Is there a blood test for endometriosis?

No, there is currently no blood test that can reliably detect endometriosis. The 2025 German S2k guideline explicitly states that biomarkers are not suitable for diagnosis (Burghaus et al., 2026), and the European guideline strongly advises against using them for this purpose.

The best-known marker is CA-125, a protein that can rise when the peritoneum is inflamed. A Cochrane review examined 122 biomarkers from 141 studies involving 15,141 women. At the standard cut-off of 35 U/ml, CA-125 detected only about 40% of endometriosis cases (Nisenblat et al., 2016). The level also rises during your period, with fibroids and with other types of inflammation. So a normal result rules nothing out, and an elevated one proves nothing.

According to the guideline, other blood markers are not suitable for diagnosis either. How the diagnostic workup works instead, and what role blood tests play in the overall picture, is explained in our article on endometriosis diagnosis.

How useful is the saliva test for endometriosis?

The saliva test is the most interesting new approach, but it is not yet standard and does not replace a medical evaluation. It measures a pattern of small RNA molecules in saliva, known as microRNAs, which regulate gene activity.

The figures from France are impressive: in a validation study of 971 women with symptoms at 17 centers, the test identified 97.3% of endometriosis cases and was correct for 94.1% of women without endometriosis (Bendifallah et al., 2025). But context matters: the research team is closely linked to the manufacturer, and 77% of the women studied actually had endometriosis. In a group where the condition is less common, more of the positive results would be false, and whether the test performs as well in women with milder symptoms has not been studied. Whether the test leads to better decisions in everyday practice has not yet been shown.

In Germany, the test is a self-pay service costing around 800 euros. The Endometriosis Association Germany (Endometriose-Vereinigung Deutschland) points out that the German Endometriosis Working Group (Arbeitsgemeinschaft Endometriose) does not currently recommend it for routine use. There is no home test you can order that detects endometriosis. What is offered online as a test are questionnaires like the one above.

Why does diagnosis take so long?

Because period pain has long been considered normal, and the symptoms resemble many other conditions. In a study from Germany and Austria, it took an average of 10.4 years from the first symptoms to diagnosis, and 74% of the women had received at least one misdiagnosis along the way (Hudelist et al., 2012).

More recent German data is somewhat better, but still not good: in the EndoCost project, the delay averaged 7 years (median 5 years), and women whose symptoms had started in their teens waited the longest (Brandes et al., 2022). Whether a self-test shortens the time to diagnosis has not been proven. The more specifically you describe your pain, with numbers, days and the impact on your daily life, the better it can be assessed at your appointment.

How do you prepare for your appointment?

The best preparation is a symptom diary kept over two to three cycles, plus your answers from the self-test. This supports the structured pain history that the guideline calls for.

Each day, note your pain on a scale from 0 to 10, when it occurs and what triggers it: your period, sex, bowel movements, urination. Write down which painkillers you take, at what dose and how well they work. Note how many days you had to cancel plans. Numbers like these turn “I have bad period pain” into a picture your doctor can work with.

Also think ahead about whether you are trying to conceive or hoping to, because this affects which tests and treatments are an option. And bring two or three specific questions with you, for example:

• What could be causing my symptoms?
• Would an ultrasound by an examiner experienced in endometriosis make sense?
• At what point would a referral to a specialized facility make sense?

When does an endometriosis center make sense?

A specialized center makes sense above all if your symptoms continue despite treatment. The S2k guideline recommends that women be reassessed at a facility specializing in endometriosis after two unsuccessful hormone therapies (Burghaus et al., 2026).

In Germany, the Endometriosis Research Foundation (Stiftung Endometriose-Forschung), together with the European Endometriosis League, certifies practices, clinics and centers at several levels. You can find the list on the website of the Endometriosis Research Foundation. You are allowed to actively ask your gynecologist for a referral. That is not a sign of mistrust, it is part of good care.

What you can do yourself until your appointment

Until you are seen, exercise and nutrition are the main things you can work on. Neither replaces a diagnosis, but both are recommended in the guideline.

The S2k guideline recommends regular physical activity at any intensity, such as endurance training, yoga or stretching, to ease period pain (Burghaus et al., 2026). For nutrition, it advises a healthy diet rich in vitamins and fiber and advises against special diets without a medical reason. What this means in practice is summarized in our article on nutrition for endometriosis.

Many women also look at micronutrients during this time. Honesty helps here: micronutrients can complement a balanced diet, and independently of endometriosis, the following applies: zinc and selenium contribute to the protection of cells from oxidative stress, and magnesium contributes to normal muscle function. A meta-analysis of 13 small studies found less pelvic pain in endometriosis with antioxidant vitamins, but the quality of the data is limited, and vitamin D alone showed no significant effect (Zheng et al., 2023). NAC was studied in an Italian observational study of 120 women who reported less period pain after three months, although there was no control group (Anastasi et al., 2023). For curcumin, there are so far only very small studies with conflicting results. Which nutrients have been studied best is covered in our overview of the best supplements for endometriosis. Supplements are a foundation, not a treatment.

Sleep, stress and warmth: the underestimated part

Pain disrupts sleep, and poor sleep makes you more sensitive to pain. According to a meta-analysis, around 70% of women with endometriosis sleep poorly (Zhang et al., 2024), and in experimental studies, sleep deprivation lowered the pain threshold (Chang et al., 2022). So track your sleep in your symptom diary too. Psychological and mindfulness-based programs reduced pain during sex and pelvic pain in randomized studies, but the evidence is still weak (del Pino-Sedeño et al., 2024). And one simple tool for bad days: in a large survey of women with endometriosis, heat was the most commonly used strategy (Armour et al., 2019).

When you should not wait for your appointment

Sudden, very severe pelvic pain, fever together with abdominal pain, circulation problems such as feeling faint, unusually heavy bleeding or severe pelvic pain when you might be pregnant need to be checked by a doctor right away, at a practice or in the emergency room.

If you would like to organize your questions for your next doctor’s appointment, you can do that in a free initial consultation. Medical questions about your symptoms are for your gynecologist to answer.

If you would like to talk in more depth, you can go through your symptom diary with our medical team in our doctor-led video hormone consultation and look at sleep, stress, nutrition and micronutrients together. We do not make a diagnosis there; ultrasound and examination stay with your gynecologist.

At a glance

• Fill out the self-test and keep a symptom diary for two to three cycles.
• Do not expect a diagnosis from blood, saliva or online tests.
• Ask about a specialized facility if your symptoms continue despite treatment.

Conclusion

There is no endometriosis test that can tell you at home whether you have endometriosis, and blood and saliva tests are not yet part of standard diagnostics in Germany either. What does exist is something less spectacular yet very effective: your symptoms, clearly categorized and supported by data.

Use the 12 questions and your symptom diary as a basis for discussion, not as a verdict. Take severe pain seriously, even if you have been told for years that it is normal, and ask for a referral to a specialized facility if you are not getting anywhere. You can find an overview of causes and treatment options in our Endometriosis Guide.