The Tears Test, explained.
A screening tool that starts with a few tears. Here is how it works, what it can tell you, and where it fits.
Of all the tools in modern breast screening, this one sounds the most improbable: a test that begins with a small strip collecting your tears. A slip of paper rests inside your lower eyelid while you sit with your eye gently closed for five minutes. No needles, no imaging, no discomfort, done.
The idea underneath it.
Your body is constantly shedding molecular information. Tear fluid, it turns out, carries proteins whose patterns can shift in the presence of breast disease, specifically two called S100A8 and S100A9. When both rise to critical levels together, that pattern correlates closely with the earliest stages of breast cancer, long before anything would appear on an image. The Tears Test analyzes those protein biomarkers and flags patterns associated with abnormality, a biological signal to sit alongside the anatomical picture that imaging provides.
And it is not a genetic test. It doesn’t tell you what you inherited, it tells you what your body is doing right now, which is the part that can still be changed. Repeat it annually, or every six months if your risk is high. Think of it this way: imaging shows what tissue looks like. Biomarker testing hints at what the body is doing. They answer different questions, which is exactly why they pair well.
What the numbers mean.
In validation studies, the test has reported sensitivity in the low nineties, meaning it correctly flags the large majority of cases where disease is present. Like every screening tool, it is not perfect and it is not a diagnosis: a flagged result means “look closer with imaging and clinical evaluation,” not “you have cancer.” A clear result is reassuring but does not replace your regular screening rhythm.
Where it fits.
- Alongside annual imaging, as an added layer of biological insight, two different kinds of evidence agreeing with each other is more reassuring than either alone.
- Between screenings, for women who want a low-burden check-in during the months when no imaging is scheduled.
- For women easing back into screening after years of avoidance, a gentle, painless first step that requires nothing but showing up.
The bottom line.
The Tears Test will not replace imaging, and it is not meant to. What it offers is another honest data point, gathered with zero discomfort, in a screening philosophy built on seeing you from more than one angle.