Sorting Through White Blood Cells in a Sample to Diagnose Disease

A sensor designed by researchers at Stanford University to detect bubble boy disease can be used to help identifying many other conditions.

An illustration of white blood cells flowing through an artery BioMedical/Shutterstock

Researchers at Stanford University School of Medicine developed a cell-sorting device, which they call an integrated microfluidics-waveguide sensor, that can sift through and measure the number of different types of white cells in a sample of blood.

Originally developed to detect severe combined immunodeficiency, or "bubble boy disease," the researchers quickly realized that the technology can be used to help identify other, more common conditions. The technology behind the sensor is described in the latest issue of Biomicrofluidics.

More about the new technology from Stanford's announcement:

The body has many types of white blood cells, each with different disease-fighting roles. White blood cell counts already help doctors diagnose some diseases and monitor treatment of others, including cancer and AIDS, but current cell-counting methods require fairly large blood samples and costly, slow equipment that can be operated only by trained laboratory technicians.

One possible application of the new sensor would allow doctors to solve a common, vexing problem: determining the cause of a runny nose. Instead of using the current trial-and-error method for diagnosing the problem, doctors could take a mucus sample from the patient in their office and measure the white blood cells present. Elevation of one type of white blood cells could implicate allergies, another cell type could point to a sinus infection, and a third type of elevated cell count could suggest that the runny nose was simply due to the common cold.

The new sensor consists of a small, rectangular piece of glass impregnated with a strip of potassium ions. The potassium-impregnated glass acts as a "waveguide" -- laser light shone into the strip of glass is transmitted down it in a specific way, and the light emitted from the far end of the waveguide can be measured with a light sensor.

To operate the detector, a patient's fluid sample is mixed with antibodies specific for the particular type of white blood cell to be measured. Each antibody is attached to a tiny bead of magnetic iron. Then, the sample is injected in a small channel on top of the glass waveguide. A magnet under the glass traps the labeled cells in the channel. The iron beads block a bit of the laser light that would otherwise pass through the waveguide, and this reduced transmission is measured by the light sensor at the far side of the glass.


This post also appears on medGadget, an Atlantic partner site.

Presented by

medGadget is written by a group of MDs and biomedical engineers.

Never Tell People How Old They Look

Age discrimination affects us all. Who cares about youth? James Hamblin turns to his colleague Jeffrey Goldberg for advice.

Join the Discussion

After you comment, click Post. If you’re not already logged in you will be asked to log in or register.

blog comments powered by Disqus

Video

Never Tell People How Old They Look

Age discrimination affects us all. James Hamblin turns to a colleague for advice.

Video

Would You Live in a Treehouse?

A treehouse can be an ideal office space, vacation rental, and way of reconnecting with your youth.

Video

Pittsburgh: 'Better Than You Thought'

How Steel City became a bikeable, walkable paradise

Video

A Four-Dimensional Tour of Boston

In this groundbreaking video, time moves at multiple speeds within a single frame.

Video

Who Made Pop Music So Repetitive? You Did.

If pop music is too homogenous, that's because listeners want it that way.

More in Health

Just In