Thank you, Kanchan. It's true that this information should be more widely known about - but because there are not pharmaceutical treatments, it isn't! I don't have a questionnaire as such, but here are a couple of websites that list that signs and symptoms, that you may find helpful.

https://www.healthywomen.org/content/blog-entry/10-signs-you-have-leaky-gut%E2%80%94and-how-heal-it

https://www.medicalnewstoday.com/articles/326117#symptoms