How to retest using FoodMarbleUpdated 10 months ago
Using the BLUE FoodMarble app, head to "challenges". Choose the lactulose challenge (or the glucose challenge if you are using glucose instead) and you will be guided through how to do the sample.
As a reminder, here's our video on collecting testing - skip forward to the 3-minute mark in this video on how to prepare for your FoodMarble breath test: