What does an elevated BUN/Creatinine ratio mean? It is 27 (norm is 8-20). I also have a slightly high RDW 15.1 (norm 11.7-15.0). My TSH is 4.23. She didn't do any other thyroid test. Cholesterol was good (I think) Total at 166, triglycerides 64, HDL 60, LDL 93. p.s. According to the doctor, everything is normal and no cause for concern.