Thanks for the question.
Your doctor is trying to treat any sort of genealized infection that may be growing. It would be beneficial to know if he sent it for a culture.
Blood in the urine can be caused by infection, kidney stones, cystitis, or certain medications. It can also be caused by trauma to the urinary system or kidneys.
Sometimes BPH can cause blood in urine. So can kidney disease and ocassionally diabetes.
Ketones in the urine can be caused by dieting, starvation, insulin overdose, severe stress, nausea and vomiting. Do you know if there was glucose also present?
The protein in the urine depends on how high it was.
If you are not dieting, drink large amounts of alcohol, or have any other medical conditions then starting with antibiotics is prudent. But you should probably have blood work drawn and possibly a CT scan.
It's too early to panic as these may not be related and all may have easy treatments.
Please let me know if you have any other questions.
Here is some more information.