Hi, have you been made aware that the HPL molecule (what is erroneously referred to as "krpytopyrrole") is very unstable? It is very prone to degradation in light, heat, and from oxidation. It's supposed to be stored with ascorbate (NOT ascorbic acid) and away from light, preferably frozen, between collection and testing.
This is, unfortunately, the kind of test which has a high rate of false negatives for that reason which may be due to any of the points of the chain between collection and testing. Your low reading may be due to this and I'd look into the quality of the lab you used to do this.
I've had to become a bit of a self-taught expert about these things since I myself was cured, of symptoms at least, from some pretty dire Mental Health disorders after testing and diagnosis. I've seen a lot of misinformation and confusion about this which is why I felt compelled to write
this. I felt the best approach would be to tie all the research I found relevant into a little narrative, and let people explore as they see fit. There's a lot to wade through. I'd appreciate any comments.