Tracking patient health metrics over time: how Trendline started

Trendline did not start as a product idea. It started with a problem I saw up close through my partner's work as a doctor.

She was trying to follow changes in her patients' health over time, but their information lived in too many places: notes, paper records, spreadsheets, and results from different points in time. The data was there, but seeing one patient's history quickly was much harder.

Starting with one clear patient history

I started with something small: a way to keep measurements together and see how they changed over time. It was enough to replace the work of piecing a patient's history together from separate records during a visit.

As she started using it, the value went further than either of us had expected.

What changed during patient conversations

Trendline helped her follow patients' health metrics over time, but it also changed how she explained those changes to them. Instead of pulling numbers from different notes, papers, and spreadsheets, she could walk through the history visually and show what had changed.

She told me that patients followed the explanation more easily, and the same visual history helped them explain it again to their families. She also felt that those conversations helped build more trust with her patients.

How real use changed the product

That feedback changed how I thought about Trendline. It was not only about keeping data organized anymore. It was also about making health data easier for people to understand and talk about together.

The first useful version in under two weeks

The first useful version was running in under two weeks. What mattered most was not just building quickly, but putting something useful in front of a real user early enough to learn what the product could become.

What Trendline is today

Today, that product is Trendline, a web app for tracking patient and family health metrics over time. It keeps measurements in one history, turns them into charts, and can read numbers from a photo of a lab report for the user to check before saving.

If this problem sounds familiar

If you keep piecing information together from notes, paper records, and spreadsheets, describe the last time you had to do it. What were you looking for, where did you look, and which part took the most effort? You do not need to know what to build. One real example is enough to start looking into whether software could help.