After experiencing stomach discomfort, I took the home test and it came back positive. It requires caution because it is a bit tricky. Normally, it should be done by professionals, but if you follow the instructions (they are very good and you can find them on the internet) to the letter, it will work. In the instructions, you will also see that the test is effective, and according to the company itself, it has nearly 100% accuracy compared to histology/biopsy. Even if the line is barely visible, it indicates positivity. I definitely recommend cross-checking with a breath test (C13)