Having arthritis from long and taking medications for the same. As part of that routine blood tests are being done. In current RFT serum
creatinine is 0.4 and potassium is 6.5 mmol/l. Remaining all are normal in RFT. 3 months back creatinine and potassium were also normal and everytime this test was done previously they were normal. Taking only arthritis medications, nothing else. Please advise what this could be