Fit test score 28 .

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Hello everyone, is a score of 28 high ? I have had a little bit of a problem with finding Bright red blood in my stool just a little bit very sparse . 
I did a fit test on a stool that I had straining with and it had a little blood on it would this effect the score ? . Does a fit test pick up visible blood has well has occult blood ? 
I am having a colonoscopy next week .