About three times, he had some blood in his poop, not more than a teaspoon, covered in mucus, but not actually in the feces itself...(that suggests to me that it is near the end of his poop track, but not totally sure). Had him to the vet once. ran a series of standard feline tests which all came back negative. Bland diet for 3-4 days. occucred again, twice. second call to vet, put back on bland diet.
About 6 weeks has elapsed since first notice.

Any vet wanna add a little for me and/or other person that has been thru something of the like?
4 years old. Russian blue. 12 pounds. Cute as hell.

blood with loose stool
indicates coccidiosis (mucus-like) or hookworms

blood with normal stool
indicates stress, worms, anal gland problem or injury to anal sphincter

blood with constipated stool
straining while defecating

Good luck!

Are you feeding him dry commercial cat food? I'd venture that's the problem. The only times my cats have blood in their stools is after they've been eating dry commercial cat foods for a few weeks. I switch them back to home cooking (I make my own cat food -- which is the general rule, now) and the blood goes away along with a host of other problems the (commercial) cat food creates.

I'm guessing (that) because the dry food dehydrates cats so severely it rips apart their insides a little -- enough to cause them to bleed. (It's like the commercial foods are drawing moisture from any source and is taking it from the walls of the intestines and/or other body parts, (hence) drawing blood -- that is dumped with the stools.

My best advice is to make your own cat food. :)

Personal experience with cats; naturalist.

Maybe you should try a different vet. It definately isn't normal

Lack of RBC .

I would recommend to check with an other vet - preferable a pet clinic since the standard tests the very most vets could perform seems not to be sufficient to track down the cause.

pets question and answers,www.5d2d.com

Since food change obviously is not the cause, you could stick to the food you currently feeding.
If mainly dry food - just make sure he drinks enough water. Either by providing multiple water bowls or one pet fountain since running water attracts cats to drink (own experience with one cat who had bladder stones- permanently disappeared after she got a pet fountain and started to drink enough)

Had an equal case (not diarrhea but severe case of kitty flu) with one rescued kitten. It was playful, active, eating and drinking and the "standard" vets just said either to keep him until he dies what he will do soon due the severity of the infect. I said no thanks since he was playful and eating. Finally I ended up in a high tech vet clinic (guess the 12th or 14th vet I took since I don't like the anonymity there) and they were basically the only vets who said, as long as he plays we try. My cat got antibiotics, homeopatics, uv-light treatment (got one lamp borrowed for home treatment) ... and now my kitten is in the age of 15 years. Sometimes he is a very happy and quite healthy senior cat now who only shows slight symptoms of the flu few days per year. pets question and answers,www.5d2d.com

High tech vet clinics just provide the best tools and many vets with different experiences and ideas at one spot which increases the chances to successfully track down the cause of the symptom(s) a pet shows.

Own experience.