Age 72. why do serum creatinine levels go from 2.0 mg/dl to 2.8 to 1.9mg/dl in 1 month. serum urea 5.0 mg/dl. is it some stage of ckd? if yes which?

See below : Cr levels show deputation of creatinine, us doctors use it as a marker of renal filtration, they tend to change with age, however you should have your tests interpreted by the doctor who order them, so you don’t get confusing information.

Kidney disease : To answer that it should be understood that tests results are taken into account with the things the patients, says, the examination, lab tests, and all other diagnostic tests. It sounds like you probably have kidney disease, but you should see your doctor for accurate interpretation

Creatinine: Creatinine of 2.8 raises concern. The low BUN rules out dehydration. If you're taking medications like lisinopril or ARB's like losartan,irbesartan,etc these could raise creatinine levels. If you have diabetes or longstanding hypertension or protein in urine, there would be concern for chronic kidney damage. As Dr. Torres states, your physician can advise you best.