Thank you for participating in the UChicago IBD study’s Litmus Program. This program will provide the study with valuable information and insights for Dr. Rubin’s ongoing research on IBD.

It’s important that you follow these instructions for the use and operation of your Fitbit for the duration of the program. This will ensure that we are collecting complete, accurate information.

If you have technical difficulties at any time, please email:

If you have a medical question, please contact Dr. Rubin’s office at:

Phone: (773) 702-9200
Office: 5841 S Maryland Ave MC 4080
Chicago, IL 60637

In the event of a medical emergency, call 911.


How should I wear my Fitbit?

Only wear your Fitbit on the wrist of your dominant arm. It’s important that you only wear it on one wrist and don’t switch back and forth. We will not be able to collect accurate information if you keep it in your pocket or anywhere else on your body.

We ask that you wear the Fitbit as close to 24 hours a day as possible, so we can collect complete and accurate information for the study.

Please do not allow other people to wear your Fitbit, as the wristband will track their activities, not yours, while they’re wearing it.  

What does the Fitbit need to track?

The Fitbit will automatically track a variety of data, such as sleep and physical activity. However, to enable this tracking, you will need to properly set up your Fitbit. To make sure your Fitbit is set up correctly, please follow the instructions in the Getting Started Guide for iOS or Android.

Additionally, you will need to complete tasks in the Litmus Health App for us to collect other data needed for the study.

When Can I Take It Off?

It’s important that you wear your Fitbit as close to 24 hours a day as possible. We even need you to wear it when you’re sleeping, as the Fitbit continues to collect information while you’re resting.

We recommend that you take the Fitbit off only when you are showering, swimming, or charging the device.

The Fitbit is not waterproof and will be permanently damaged if you get it wet, so you should remove it before showering and swimming. Light rain or sweat will not harm the device.

The battery life of the Fitbit is estimated at 5 days. You will need to remove it from your wrist to charge it with the USB charge cable provided in the Fitbit box. This process takes approximately 2 hours, at which point you can put it back on your wrist.

What should I do with the Litmus Health app?

Together, your Fitbit and Litmus Study Companion App collect the information we need for the study. Please refer to the Getting Started Guide for iOS or Android to make sure your Fitbit and the app are set up properly.

The Litmus Study Companion App will regularly ask you to complete simple tasks, such as logging information about how you are feeling. These tasks are simple and take very little time to complete. It is important that you complete these tasks whenever the app prompts you to do so.

We request that you open the app once per day to see if you have any new tasks waiting for you. The app will also notify you when you have new tasks to complete.

Should you wish to track your fitness in the Fitbit app, you may do so. However, that is not a replacement for completing tasks in the Litmus app. We will not receive the information we need for the study if you don’t complete the tasks in the Litmus app.


How do I know if the study is getting my information?

As long as you’re using the Litmus Study Companion App to complete tasks, we will receive your information. However, if you have any questions or concerns, you can always contact us at

The app isn’t working. What should I do?

If you have any technical difficulties with the Litmus app or the Fitbit, please send an email to:

Please describe the problem you’re experiencing in the email, and a support agent will contact you to resolve the issue. Please do not include any personal information or health-related details, other than your email address.