What else would make the serum creatinine rise abnormally?

Obstruction. When the serum creatinine rises, indicating a problem with the kidney, obstruction should always be ruled out. Obstruction is a blockage that usually affects the ureter and leads to increased pressure in the kidney (Figure 3). An abrupt decrease in urine output is a sign of obstruction. A renal transplant ultrasound can diagnose the obstruction and indicate where the problem is. The obstruction can be relieved

by decompression. A tube can be put into the compressed area of the kidney or into the bladder. It is important to study the kidney, ureter, and bladder to determine the etiology of the obstruction. Obstruction is easily reversible.