What kinds of tests has he been run through? A urine culture to test for UTI? CT? X-ray? What were the findings? How much blood is he expelling, i.e. is the urine just tainted red, or is a deep red, potentially with clots? Has he had any procedures recently, like a TURP (which is essentially a widening of the urethra by cutting the prostate). You may not know all the answers, but a UTI can indeed cause such issues. If you do know, is there anything significant beyond infection? Is it causing him any pain and where?

Sorry for being nosy. I hope it's just the UTI. You just never know abou these sorts of things. I'm sure the hospital is being thorough in their investigation. Best of luck, and may the Lord bless you and your dad.