A Wearable That Finally Tracks Female Hormones in Real Time
Estonian founder Kerli Luks spent years as a doctor watching women navigate hormonal health on incomplete data. Her company Muun Health is building the first continuous hormone monitoring device.
Women's hormonal health has one of the oldest diagnostic problems in medicine. The gold standard for measuring female hormones is a blood test, taken at a precise point in the cycle, producing a single result that tells a clinician what was happening at that moment and nothing more. Kerli Luks spent years watching that limitation play out in her patients, then spent three years building a wearable biosensor to replace it. Muun Health, her Estonian deeptech startup, is developing the first microneedle-based device for continuous, real-time female hormone monitoring.
She thrived in the chaos of emergency medicine, then noticed something the system had stopped questioning
Kerli grew up in Estonia with the kind of curiosity that filled every available hour. She was involved in everything she could find, restless in the way that tends to produce either specialists or generalists, and medicine pulled her in because it promised an answer to how the human body actually works. She was the first doctor in her family. Nobody told her what the job would really look like.
She found out in Finland, where newly graduated doctors are handed full patient responsibility from day one. She thrived on that. The emergency room was fast and total, and she learned to move inside it without hesitation. But after a few years, she began to notice what emergency medicine structurally cannot do. Every shift had consequences. Someone arrived because something had already gone wrong. There was no time for anything upstream, and the system was not designed to look for it.
When COVID brought her back to Estonia, she moved into private practice and the tempo changed entirely.
Eighty percent of her patients had hormonal issues, and the best tool available was failing them
At the private clinic, the pattern became hard to ignore. Around 80% of the women she saw had some form of hormonal issue. Chronic fatigue, weight gain, irritability, and difficulty getting pregnant. Many of them had been living with these symptoms for years. When Kerli reached for the diagnostic tools available, she kept arriving at the same limitation. A blood test, taken at a specific point in the cycle, gives a snapshot of a system that moves continuously.
She had been using a continuous glucose monitor herself, following her own data in real time. She kept asking why nothing equivalent existed for hormones. She looked in Estonia. She looked further. At that point, nobody was building it. There were urine tests and saliva tests, but these were unreliable, inconvenient, and incapable of showing fluctuation over time. What she needed was quantitative hormonal data, not proxies or inferences, actual measurements that a clinician could act on.
Three years ago, she decided to build it herself. Muun Health is developing a microneedle-based wearable patch that monitors female hormones continuously and delivers results with up to 98% accuracy directly to the user's phone. The device is painless, self-applied, and designed for both home use and clinical integration, sitting within the EU's MDR IIa medical device classification. The company reached laboratory proof of concept in 2025, closed a €546k pre-seed round, and now has an R&D team of thirteen working across academic and clinical partnerships in seven European countries.
Prevention has always been the goal. Now she has the data to get there.
What drives Kerli is not the device itself but what the device makes possible. She describes the research dimension as the part that matters most to her in the long run. Women's health has been systematically under-researched, and continuous hormonal data collected at scale would change what medicine can know about the female body. "I can't even put into words what impact this would be for women's health if we have that device and are actually able to measure hormones," she said.
The immediate applications are in fertility, where Muun Health is entering the market through European IVF clinics. From there, the platform extends to PCOS management, perimenopause, contraception, and beyond. But the frame she returns to is the one the emergency room made impossible. With continuous hormonal data feeding AI models over time, the logic of women's healthcare can shift from reactive to preventive. Women get real information about their own bodies. Clinicians get the quantitative picture they have never had. The load moves from the system to the individual, and prevention becomes possible because the data finally exists to support it. Muun Health is targeting MVP in 2027.
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