na eun  choi   [now-in · cho-ee]
   Designer working at the intersection of strategy, sustainability, & physical form

ABOUT














 






 














 


















Pearl


a continuous hormone monitor that uses sweat and biometrics to help women in perimenopause understand their bodies again

Concept Innovation, CMF, Design Research,
Iterative Prototyping, Creative Direction

Time frame: 14 Weeks (05.2026)
Solo Project



Opportunity:



Nothing on the current market directly measures
women’s hormones  

Most all use biometrics to provide an estimation of cycles 
and aren’t specifically geared toward womens health 




Perimenopause 


is a process where Estrogen levels decrease 
and hormones fluctuate, as the body prepares to stop menstruating  














Hormone changes affect all parts of the body


When your body changes, 
you don’t feel like yourself anymore  




The Struggle For Patients and Doctors




Women struggle to get proper care: 

  • finding medications to solve their symptoms
  •  lack of trusted knowledge source 
  • no acknowledgment of the emotional stress of perimenopause













Doctors have to trial and error medications:

  • very little information on hormone levels 
  • multiple symptoms are misguiding for diagnosing 











Blood test are only a snapshot in time 












Hormone levels over time is more crucial to understanding and addressing symptoms

PEARL










Pearl System

Pearl’s Mainbody is an adhesive, continuous hormone monitor (CHM) that uses sweat and biometrics to measure hormones 

It also includes:
+ Companion app 
+ Charging Case 
+ Band 






Layering Trust For Accuracy



1st   Level - Sweat Sensors developed by Caltech 

2nd Level - Biomentrics (Heartrate, Sleep, Temperature)

3rd  Level - Algorithms to help sort data/find patterns
 









Pearl’s Body Placement


Because Pearl is non-invasive, it can be placed on any part of the body 














Pearl helps you understand your 
body again






The App as a Tool 


  • Shows your real-time hormonal data 
  • Sets reminders for medicines 
  • Gives your a way to connect with friends regarding shared symptoms 




Easy to Carry Charging Case 


Rechargeable battery case allows for Pearl to fit busy lifestyles and be travel friendly





Personalizing Pearl


In interviewing individuals with Continuous Glucose Monitors (CGM), I found that many people preferred not to have their CGM’s visible. Whether for daily life or for special events, people saw the device as an eyesore. 

Knowing this, I wanted to design beauty into the device itself and make it customizable for individual tastes/skin colors. 


Ways to Wear 

Statement 

Casual


Pearl as a statement 
Jewelry Piece 







Thank you for your time