My wifes latest creatinine is 3.9 and a eGFR  of 14. She is African-American. A month ago they were 2.06 & 28.  The cardiologist who ran the tests said she would run another next week & then make a decision as to whether to recommend a nephrologist referral. I think we should be seeing one NOW.  ALSO,  what stage of CKD would you assess this to be, 4 or 5?
First we need to look if she has -acute renal failure(ARF) or -CKD or-ARF on She has to undergo a battery of investigations like urine routine, sonography, CBC. If it is a CKD she falls in stage 5 as per the EFR.you have to see nephrologist at the earliest. Thanks