I do not know how you can say that "the odds are good" that it is a UTI.The odds are good that it is a UTI (Urinary Tract Infection).
1)A UTI would have blood in the urine, not the semen.
2)As well, urinating would have a burning/painful feeling.
3)He would have to urinate more frequently.
I do not believe that OP has any of those symptoms.
Please tell us what symptoms he has that makes you strongly believe it is a UTI? And don't say blood in his ejaculate but not in his urine.