I'm a 52 year old man whose GFR over the last nine months dropped from 68 to 42. The worst drop, from 52 to 42, occurred just over the last 3 months. A recent kidney ultrasound was normal, showing normal sized kidneys with no blockages. Bladder output was normal too. The 24 hour urine test I took just a couple months ago was also normal showing normal urinary output, creatinine clearance, and protein output. Physically, I feel great (no major aches and pains, breathing difficulties, problems urinating, etc.). I've had type 2 diabetes for a number of years, but when I started a low carb diet about 18 months ago, my blood sugar control improved considerably (current A1C 5.7). I have moderately high cholesterol (I always have - runs in family), and my blood pressure is normal. So with the kidney ultra sound and 24 hour urine test results all showing normal, I'm at a loss as to why my GFR has been decreasing so rapidly. Any of your thoughts or suggestions with regards to this decline would be greatly appreciated! I have an appointment to see a Nephrologist next week, and I hope he'll be able to assist in getting this issue under at least some control. Psychologically, I'm a wreck right now. If my GFR continues to decrease at its current rate, I'm worried I'll be on dialysis within a year. Ugh!