This is Dr. David
blood in the urine with a catheter in can be from irritation of your bladder from the foley catheter in your bladder
or it can be a sign of a bacterial infection in your urine.
you should call up your doctor tomorrow, let them know about the blood
they may want to test your urine for infection.
you may have to make sure you drink more water to keep fluid and urine flowing through the bladder to prevent stagnant urine from building up an infection.
let me know if you have other questions.
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