Check out some of the places Dr. Mcoomb’s recommends for getting a stool test done:
I believe he mentioned some in his latest video.
Metametrix labs in (north dakota?) has a comprehensive stool analysis test that will tell you whats in the stool. The results need to be analyzed by a naturopathic doctor for the best treatment plan or to determine your levels. The only problem with stool tests is that everyone has candida in their body so it should always come up as a positive result.
He also feels that anyone who has ever taken antibiotics has a gut flora imbalance and so I would look no further than this as the cause.
There is also the likelihood that you have parasites as well because everyone has parasites, just at different levels. If you have a candida overgrowth, parasites are very opportunistic and can thrive in the same environment.