If Nima finds gluten in your food, chances are it's not a pleasant surprise, so the first step is to take a deep breath.
If you're at home, you can dispose of the contaminated items, and you can always contact the source to let them know your results.
If you're at a restaurant, you can explain to the wait staff that Nima detects the presence of gluten and that this food/dish has come up positive for gluten. Politely let them know you're trying to avoid gluten, and that you can't eat the food they've brought you. Be specific – always let them know if you have Celiac disease or a food-allergy. At that point, you can either order something else, or simply sit this one out. It's a bummer when this happens, we know, but it's definitely better than ignoring your better judgment and getting sick.
Here are some conversation starters for letting restaurants know that Nima found gluten in your food:
"Thank you for your help so far this evening. I’m so sensitive to gluten that I have this device that allows me to test my food for trace amounts of gluten. Unfortunately, [this item] came back positive for gluten and if I eat it I'll get very sick. Do you have other gluten-free options that I may be able to order?"
"I really appreciate you caring for my food-sensitivities. Eating gluten makes me so sick that I carry this device with me to test my food and see if it has any gluten in it. This device is really sensitive, testing at least 20 parts per million within the sample of food. It shows me a "Gluten Found" if it detects any gluten, and one just showed up when I tested this item – can you please help me find something else to eat?"
"Thank you so much for all your help navigating this menu. As we discussed my sensitivity to gluten is really huge --- and I’m using this little device to help me test my food before I eat. This sample just showed up as containing gluten, so it’s not something I can eat. Are there some alternatives on the menu that may be safer?"