A creatinine level of 1.3 mg/dL is only slightly above the typical normal range, so please try not to worry. This mild elevation and your itching can be discussed at your upcoming visit. I do not recommend starting any new medications or ordering extra tests on your own before then. For now, please stay well-hydrated and continue taking your olmesartan (olsertain) exactly as prescribed unless your doctor tells you otherwise. Your doctor may suggest a simple repeat blood test or a urine test at your appointment to safely monitor your kidneys.