CKD Tests

My cat Molly has CKD and was diagnosed around a year ago after doing a senior blood work up and urine test. She wasn’t showing any symptoms.

I’m bringing her in for a checkup/blood work on Wednesday, my vet also wants to do another urinalysis

Can someone please explain to me why it’s necessary to do both? Wouldn’t the blood test tell him everything he needs to know?  I asked the receptionist when I made the appointment but the vet was busy with another patient and couldn’t take the phone to explain and I do plan on asking on Weds I just want to be well informed before I go in.

It’s less expensive to do just the blood test and checkup... I don’t mind spending the money and doing both if that’s what she needs I just want to understand why.

 And Molly is around 12.5-13 years old if that makes any difference 

The urinalysis will show if there are any crystals and the specific gravity of the urine. It will also show how much calcium and other nutrients she is eliminating.  It's similar to when you go get a physical at the doctor.  They take blood and they do a urinalysis.

The UA is also important because it'll show if she has protein in her urine which is a complication of CKD that needs treated to slow down the progression of the disease. Also it's pretty common for CKD cats to have infections which will show up as a high WBC count.

Thank you

I'll get  the urine test done as well then