Seattle Living

HemaApp: Screening Without the Sting

An app in development screens for anemia without a blood draw

By Niki Stojnic March 10, 2017


This article originally appeared in the March 2017 issue of Seattle Magazine.

Smartphones and wearable technology are changing medicine rapidly. In particular, sophisticated smartphone cameras have opened up a world of convenient innovations for patients, from the ability to do virtual check-ins with their doctor to monitoring vitals from the comfort of their home.

One of the latest camera-based tools is HemaApp, developed by electrical engineers and computer scientists at the University of Washington (UW). The app helps screen patients for anemia, a condition with which there is a shortage of red blood cells. Patients put their finger on the camera lens, and the light from the flash illuminates their blood. HemaApp then analyzes the color of their blood to estimate hemoglobin concentrations.

In an initial trial of 31 people, conducted last year and detailed in a paper, the app correctly identified patients with low hemoglobin levels 79 percent of the time with just the phone camera; when another light source was added, that accuracy went up to 86 percent. The app is still being evaluated; researchers intend to test it nationally and internationally, collecting more data and working on improving accuracy.

For leukemia or surgical patients who need frequent checks of their hemoglobin level, HemaApp would be less invasive than repeated blood draws, says study coauthor Terry Gernsheimer, a UW Medicine and Seattle Cancer Care Alliance (SCCA) hematologist and transfusion medicine specialist. And since anemia is one of the most common problems affecting adults and children around the world, HemaApp could be especially useful in places with limited resources, says Doug Hawkins, another co-author of the study and a pediatric cancer care specialist at Seattle Children’s Hospital, SCCA and UW Medicine. 

HemaApp uses technology that was first developed by the UW’s UbiComp lab for another mobile app, BiliCam, which uses a smartphone’s camera and flash to check newborns’ blood for jaundice. That app was recently tested in a nationwide clinical trial of 500 newborns.

Join The Must List

Seattle's best events delivered to your inbox

Follow Us

Stride Pride

Stride Pride


Washington is a naturally beautiful state. It’s safe. Its air quality is comparatively topnotch. That makes it one of the best states to go running, according to a report by exercise and nutrition company Fitness Voit, which ranks it No. 5. The report notes that Washington hosts only two major marathons, but makes up for…

Essay:  Blind Spot

Essay: Blind Spot

I'm white and he's Asian. Coupled, everywhere we went people assumed we weren't together

I could be at the supermarket with my husband, in line at a movie theater, or looking for furniture at Crate and Barrel, and people assume we aren’t a couple. Assume we’re strangers even. Salespeople, mechanics, hair stylists, real estate agents, and even our neighbors, at first, look confused. Until we stand close together or…

Sober: Why Dry January Means Something Different to Me

Sober: Why Dry January Means Something Different to Me

An alcoholic reflects on his journey

I was nearing the end of my screed against holier-than-thou practitioners of Dry January when I came to a startling realization: My brain was broken. This was somewhat alarming as you might imagine, but not totally unexpected. As with many crises, it happened slowly at first and then all at once. Years of arguing on…

Letter To Seattle: Grown-Up for a Day

Letter To Seattle: Grown-Up for a Day

Junior Achievement taught me responsibility and how to plan for my future

Dear Junior Achievement of Washington, My name is Tigran, and I am a sixth grader.  Last year, when I was in fifth grade, I visited BizTown with my class, and I wanted to tell you how that field trip made a difference.  To prepare for the visit, my class and I spent time with our…