Readholmes Editorial Team
March 17, 2026
Like many women who menstruate, Emma Backlund preferred not to think too much about the blood she shed every month. It was a monthly chore, an inconvenience, and for a long time, a source of intense physical dread. But when biotech startup NextGen Jane asked for her period blood in 2023, Backlund readily saved eight tampons from one menstrual cycle and popped them off in the post to the firm's laboratory in Oakland, California.
It was an unusual request, but a relatively fuss-free one she was more than happy to fulfill especially if it meant future generations could avoid the painful ordeal she faced growing up.
"When I turned 11, I got my first period and I thought I was dying," says Backlund, a 27-year-old graduate student from Minnesota. "I remember telling my mum that I needed to go to the hospital. And pretty much every period I've had since then was like that. I would throw up every month. I missed out on social activities and school. It was just this burning, stabbing, gut-wrenching pain that continued."
It took Backlund 13 years to discover she had endometriosis, a chronic, debilitating disorder in which the uterus's tissue lining starts to grow outside of it. Endometriosis affects 190 million people worldwide roughly a tenth of the world's women at reproductive age causing heavy periods, agonizing pelvic pain, bladder or bowel problems, and, in many cases, infertility.
Urine samples have been examined by physicians since Babylonian and Sumerian times, some 6,000 years ago. Stools and venous blood followed suit one and two centuries ago. Yet, period blood has rarely received clinical attention. This is a scientific oversight that is rapidly changing.
Period blood is not merely waste; it is a complex biological fluid. While about half of it is regular blood, the remainder comprises proteins, hormones, bacteria, endometrial tissue, and cells sloughed off from the vaginal cavity, cervix, fallopian tubes, and ovaries.
"You get access to cell types and other molecular signatures that you just don't get from whole blood, saliva, and other sample types," explains Ridhi Tariyal, co-founder of NextGen Jane. "It's essentially a natural biopsy that's providing you insight into the reproductive organs."
Her firm has analyzed more than 2,000 menstrual samples from over 330 women since its founding in 2014. The goal is to move away from invasive procedures like laparoscopy the current gold standard for diagnosing endometriosis, which requires surgery and toward non-invasive, home-based testing.
## Beyond Endometriosis: What Can We Learn?
The potential for menstrual blood analysis stretches far beyond reproductive disorders. Because the uterus is a vascular organ intimately connected to the body’s systemic functions, the fluid shed during menstruation acts as a messenger for overall health.
Menstrual blood is a rich source of hormonal data. By analyzing levels of estrogen, progesterone, and other signaling molecules, researchers can gain a clearer picture of a person's endocrine health. This could help in identifying early signs of hormonal imbalances that lead to conditions like Polycystic Ovary Syndrome (PCOS) or thyroid issues, often long before symptoms become severe.
We are only just beginning to understand the role of the microbiome in human health. The bacteria present in menstrual fluid can indicate the health of the vaginal microbiome. An imbalance (dysbiosis) here is linked to increased susceptibility to infections, fertility issues, and even preterm birth. Analyzing this fluid allows for a more personalized approach to gynecological health, moving away from 'one-size-fits-all' treatments.
One of the most surprising areas of research is the detection of environmental toxins. Studies have indicated that menstrual blood can contain traces of heavy metals, endocrine-disrupting chemicals (like phthalates and BPA), and other pollutants. Because the uterus is sensitive to environmental stressors, monitoring these levels could provide insights into how pollution impacts women's reproductive health.
Just as standard blood tests reveal vitamin levels, menstrual blood is being explored as a medium for identifying systemic deficiencies, such as Vitamin D or iron levels. While this is still in the research phase, the convenience of collecting this sample at home could eventually make routine health monitoring far more accessible for those who find traditional blood draws difficult or stressful.
Despite the promise, there are significant hurdles to overcome before menstrual blood testing becomes a standard clinical tool.
| Challenge | Description | Impact on Adoption |
|---|---|---|
| Biological Variability | Menstrual fluid composition changes throughout the cycle and between individuals. | Requires complex algorithms to standardize results. |
| Sample Contamination | It is difficult to distinguish between uterine-derived cells and those from the vaginal microbiome. | Needs rigorous collection protocols and advanced filtering. |
| Lack of Standardization | There are currently no universal protocols for how to collect, store, or ship menstrual blood. | Makes it hard to compare data across different research studies. |
| Cultural Stigma | Menstruation is still widely considered a 'taboo' topic in many cultures. | Hampers public funding and patient participation. |
[IMAGE PROMPT]: A realistic, high-angle photograph of a clean, modern bathroom vanity. On the countertop, there is a neatly packaged, discreet, and aesthetically pleasing medical collection kit box. Beside it, a smartphone shows a health tracking app interface. The lighting is bright and airy. The focus is on the convenience and privacy of the kit. The image should convey a sense of 'at-home health' empowering, private, and technologically advanced. Avoid any clinical clutter; the focus is on the user experience of a modern medical kit.
The shift toward personalized, remote medicine is undeniable. For patients like Emma Backlund, the ability to contribute to science from the comfort of her own home is a game-changer. It turns a passive, often painful experience into an active, data-driven one.
However, it is crucial to manage expectations. We are not yet at a point where you can walk into a pharmacy, buy a test, and receive a comprehensive health report. Most current initiatives are research-based, meaning they are designed to build the databases necessary to train the AI models that will eventually power diagnostic tools.
For too long, women’s health has been treated as a 'black box.' Symptoms are often dismissed, diagnoses are delayed by years, and research funding has lagged behind other medical fields. By validating menstrual blood as a legitimate diagnostic medium, we are essentially saying that women's bodies contain valuable, actionable data that deserves to be studied, understood, and treated with the same scientific rigor as any other bodily fluid.
Q: Is menstrual blood the same as regular blood? A: No. While it contains blood, it is a complex mixture of tissue, cervical mucus, vaginal secretions, and endometrial cells. This complexity is exactly what makes it a valuable diagnostic 'biopsy.'
Q: Can I use a menstrual cup or tampon for these tests? A: Currently, most research firms provide specific, sterile collection kits. You should not use standard store-bought products if you are participating in a study, as they may contain chemicals or materials that interfere with the diagnostic analysis.
Q: Is this a replacement for my regular check-ups? A: Absolutely not. These tests are intended to be complementary tools. They do not replace the need for regular screenings, such as pap smears or consultations with your gynecologist.
Q: How do I know if these tests are legitimate? A: If you are looking to participate in research, ensure the organization is a recognized biotech firm or academic institution. Check their website for peer-reviewed publications and clinical trial registrations.
The research into menstrual blood is more than just a scientific curiosity; it is a necessary evolution in healthcare. By treating menstruation as a source of information rather than a nuisance, we open the door to earlier diagnoses for chronic conditions, a deeper understanding of the female microbiome, and a more personalized approach to long-term wellness. While we are still in the early stages of this journey, the progress made by firms like NextGen Jane suggests that the future of women's health may very well be found in the very thing society has tried to hide for centuries.
Disclaimer: The information provided in this article is for educational and informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read in this article.
Share this article
No comments yet. Be the first to comment!
Written by
Readholmes Editorial Team
Contributing writer at Readholmes. Our authors are passionate about delivering accurate, well-researched content to help readers make informed decisions.
For decades, we have been told that breakfast is the non-negotiable fuel for a healthy day. But does the science hold up? We explore the origins, the myths, and the metabolic reality of your morning meal.
Readholmes Editorial Team
Mar 15, 2026
© 2026 Readholmes. All rights reserved.
Built with care for readers everywhere.
