Wellness tech companies are increasingly interested in bodily fluids like blood, urine, sweat, and saliva. At CES 2026, it’s time to add menstrual blood to that list, too. Health tech startup Vivoo just announced the FlowPad, a roughly $4 to $5 menstrual pad that doubles as an at-home hormone test for follicle-stimulating hormone (FSH). Users will be able to either view the results directly from the pad or take a picture with the Vivoo app to get more insights.

“We started as a vaginal pH tracking liner for your panties that would change color with vaginal discharge,” Vivoo CEO and cofounder Miray Tayfun tells The Verge. “It’s evolved into a period pad with microfluidic channels that capture blood, and under the pad, there’s a window that shows your FSH levels.”

Tayfun says the benefit of integrating a hormone test into a pad is it’s a hygienic product that menstruating people already use. The challenge, however, is that blood tends to dry quickly. In other blood-based at-home tests, Tayfun explains, users often have to dilute the sample with a solution. To embed this kind of test into a pad, Vivoo had to replicate that process in a thin yet wearable design.

The pad itself has two layers. One is a “capillary capture layer” that draws in the blood and filters out particulates. A second “biomarker reaction layer” has stabilized reagents that interact with the blood to detect FSH. So, essentially, you go about your day, bleed into the pad, and when it’s time to switch out, view your results. The results are shown on the back of the pad in a windowed area, which you can see in the picture above. It resembles a pregnancy or covid-19 test. High levels of FSH can indicate lower ovarian reserves, fertility issues, or conditions such as polycystic ovary syndrome (PCOS).

“The main goal here is to make one hygienic pad less than $5, so a period won’t cost you more than $30,” says Tayfun, noting that the Vivoo team was aware of how costly sanitary products can be. “It doesn’t have to be a forever product.”

While someone could use the pads for each day of their cycle, Tayfun says it’s meant to be worn on the second or third day. Depending on what the user is looking for, it could be worn for a few months continuously or intermittently. So far, Vivoo estimates pricing at $4 to $5 per pad, with the possibility of subscription and pack configurations when the product is closer to launch. At first, Tayfun says the company will be rolling out access to researchers, medical partners, and existing Vivoo users.

The idea is for menstruating people to learn something from their FSH levels, which can be an indicator of fertility levels, irregular cycles, and hormonal patterns. That could be useful for people hoping to get pregnant, treat hormonal conditions like PCOS, or those who suspect they may be entering perimenopause, the transitional time between a person’s fertile years and menopause. Tayfun says the ideal user is someone in their 30s to roughly age 45.