We know Mr. F's body regulates fluid balance, adjusting input and output to keep body fluids within physiological levels. Let's look at his fluid intake and output again. He has taken in: 150 cc gelatin 200 cc broth 500 cc water 150 cc apple juice 500 cc water What was his fluid output? You measured 15cc of bright yellow urine, and the aide also mentioned 15 cc of urine. Depending on whether the aide emptied the catheter bag or not, Mr. F has produced either 15 or 30 cc of urine since his operation.