Can you get a false positive for Blastocsytis?

I recently had a stool test done as my bowel habits have changed.
The occult fecal test came back negative, and 1 out of the 3 stool test said I have Blastocystis present.

The first stool test said I had it, the second and third said negative.

Can a stool test for this parasite be wrong?
Also my Dr has told me that I don’t need any treatment for it and it should go away on its own, however, everything I’ve read says it doesn’t!

Does anyone have any experience with this parasite/protozoan?

I’m currently getting my 3 year old tested as she is having bowel troubles also.

Love to hear your thoughts.
Thank you.