Usually people with blasto complain of the gurgling etc. The PPTU diagnosis may be an issue - you can see this forum http://pptu.lefora.com/
for protozoa issues.
Metametrix is the best lab known, whether results are complete could be questioned. The only other choice is seeing Dr. Kevin Cahill in NYC which will cost somewhere around $500 - there is another lab in Aurora CO Dr Rafael D'angelo of Auroro Co. Parawellness Research