Sensor data overview

Overview

When a member joins Twin Health, a box arrives: a continuous glucose sensor, a body composition scale and a fitness band. This is the part of the app that gets them from the box to a first reading — unboxing, putting the sensor on, pairing, and the hour-long wait before it starts reading.

The problem: For a lot of members — many of them older, few of them technical — a box of medical hardware with a needle applicator is frightening. Fear of pain, confusing Bluetooth pairing and the worry of doing it wrong meant sensors sat unopened, and treatment started late.

What we built: A guided setup that takes one device at a time and says what it's for before saying how to use it. Putting the sensor on is three steps with a plain line about how it feels. Pairing shows the states it really has, including the one that goes wrong most. And a named person — the member's Sensor Specialist, with a call already booked — is one tap away on every screen.

Who it's for:

• Primarily: members with Type 2 diabetes setting up their sensors at home for the first time.
• Also: the remote Sensor Specialists and health coaches who help on video when it doesn't go to plan.

01Unboxing — What's in the kit, and that a call with a person is already booked.

What setup moves through

The prototype above is the whole setup. Turn the phone's Bluetooth off before pairing to see the recovery — it's the failure members hit most, and the one most likely to make them stop.

• Unbox: "Ready to create your Twin?" — and straight away, "Your call with a Sensor Specialist is scheduled for [date]." Knowing help is booked lowers the stakes of everything after.
• Meet the devices: one a screen, the reason first.
• Put the sensor on: three things to tick; the line "most people say it feels like a light tap" does more than any illustration.
• Pair: searching, found, connected — each said in words.
• Warm up: an hour, stated plainly, with a countdown, so a quiet sensor doesn't look broken.
• First reading: a number, a curve, and the next thing to do.

Designing against the fear

The hard parts were psychological as much as technical:

• Needles: reassure that applying a sensor is quick and close to painless, without overselling it.
• Purpose: explain why a member needs both a glucose sensor and a scale, without a lecture.
• A way out: a person, not a FAQ, whenever pairing fails or nerves win.
• Orientation: a member should always know which step they're on and how many are left.

02The sensor — About 3,000 readings a day, and what they let your Twin see.

One device at a time

Each device gets a screen of its own, with a three-part progress bar on top and arrows and dots to move between them.

• The sensor: "The CGM helps your Twin closely track and respond to your blood sugar trends, with guidance for your meals, activities and medications."
• The scale: "The body composition scale helps Twin understand what might cause your weight to change" — muscle and body fat, not just a number.

03The scale — What bio-impedance measures, in a sentence and a drawing.

Help that names someone

A Help button sits in the top bar of every screen. It doesn't open a list of articles; it offers a call with the member's own Sensor Specialist, who can see which step they're on.

Calm, large and legible

Soft greens and clinical blues instead of hospital white, and large, high-contrast type with generous line height for members with weaker eyesight.

04Connected — The sensor paired and the first data on its way.

Results

• Set up alone: about 85% of members paired their sensors within two days of the kit arriving.
• Support: setup tickets fell by about a third.
• Early engagement: members who went through the walkthrough logged 2.4× more biometric data in their first two weeks.

Conclusion

The hardware didn't change. Taking it one device at a time, saying what each was for, describing the needle honestly and putting a named person one tap away turned a frightening box into a first step members could take on their own.