Urinalysis

First time on this forum -Have been on the UC Forum for years. Have had Uclerative Colitis for 57 years and treated with Sulfasalizine and Lialda (mesalamine) and Prednisone and Bystolic for Hypertension. Have a Urinalysis every year due to mesalamine usage. Has always been in good range until this test last week:

eGFR 63
Specific gravity 1.03
Protein 2+
Ketones - Trace
RBC. 11-30
Crystals Present Calcium Oxalate

Seems like a lot of change in 1 year when all was in normal range last January.

Could this just be a defective Urine Test?

Thanks for any input.