Many urinalyses show microscopic blood.
When I inquire, most folks tell me they just peed into the sample cup.
All are given a towelette (to clean) and instructions (collect a mid stream sample) but most report:
1. The person in the lab said something but I wasn't really listening
2. I wasn't sure I would be able to pee and wanted to make sure I had enough for a sample
3. Oh, now I remember. I forgot. I thought the towelette was to clean my hands after peeing. I do sort of remember being told to use it to clean down there
4. Etc., Etc.
I then always offer, when the urine sample was not properly collected, to repeat the sample.
I let folks know that I would love to spend the rest of my life without having to have a cystoscopy (a fiber optic scope is put up the urethra into the bladder), if possible, and that part of the work-up for microscopic blood is to have a cystoscopy.
Both, especially men for some reason, don't seem to forget the proper instructions for future collections when informed of this possibility.