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My name is***** and I am sorry to hear that CallieAnn has lower abdominal pain. It sounds like you are taking really good care of her. Has she had a recent urinalysis and possibly urine culture? It is very common for kitties with renal disease to have concurrent bladder infections so that is where I would look first.
The next idea of an abdominal ultrasound is a good idea as well. This will help visualize the kidneys to look for cysts or possible infections in the kidneys. It will also visualize the other organs such as the spleen, liver and intestines.
Does this help? Do you have any other questions?