My partner went to docs last Sunday with what appeared to be a bladder infection: painful urination and frequency and quite a large amount of blood that appeared near the end of urination. Had a urine test but doc said it didn't show infection but there was large amount of blood so she prescribed him antibiotics. No blood present for him today and burning sensation almost gone. Doc called today saying that he needs to come back in as urine test showed high wbc.
What does this mean? Is it serious?