testing baby poop for cow's milk sensitivity/allergy?

Olivia • SAHM 🤰🏽 10/17/2016 👦🏼 🤰🏽 8/31/2018 👶🏼 Carter and Leo ❤️
My LO is exclusively breastfed and tomorrow I'm going to the doctor and they're testing his poop for the cows milk allergy. Should I make sure I eat dairy products today? Also is there a test for reflux? I feel like he has symptoms of both but I don't know?