Is it more accurate to use urine when testing for leaky gut?

Yes, it is slightly more accurate to use urine when testing for leaky gut.

Urine tests for leaky gut are the most accurate if you are specifically looking for those markers in isolation. The leaky gut (intestinal permeability) test will test this marker for you.

Two of our Gut Health Tests (the Advanced and the Ultimate Gut Health Tests) detect leaky gut through stool, because it's an easy addition to the test, and still a useful and relevant tool.