With proper care (diabetes and bp control, diet, etc) it can take a very long time to get from stage 3 though to stage 5 and then ESRD (end stage renal disease). I think it took me about 10 years. Some folks go faster, and some progress slower. The important thing is to keep in mind that life is not over. You can continue to do well even with kidney problems. Has he seen a nephrologist and the team including a renal dietitian? Diet plays an important role at this point as does glucose control.
Find out about the diet required (this will be based on his labwork) and help him follow it. Try to be positive. Are you thinking of donating to him?
Some of it does depend on luck. I had a couple of anasthetics while in that stage of kidney disease. They were very careful to keep me hydrated before and after and I had no effects on my kidneys. But it can happen. So you Mom will have to decide if the comfort from the knee replacement is worth the risk of maybe being pushed onto dialysis. Has she made plans already? It might be the time to decide what to do, just in case.
First off, because her kidneys are not working, she needs to avoid salt. Too high a level which can build up can affect her heart even more.
When you say she could not urinate, did you mean that she could not void her bladder? Or did you mean that she did not produce any urine? Not producing urine is part of having kidney failure. The organs do not work and therefore do not produce urine. If she can't void, that is a different issue adn could be due to several things including diabetes (nerve damage).
Has she spoken with a renal dietitian? There will be certain dietary restrictions now that she is on dialysis and these must be followed or she could be in significant danger.
As my husband always says, on the internet, no one knows you are a dog. How do you know that there is a legitimate doc on the other end? It could be someone trolling for into with a medical textbook or access to google.
If you are in ESRD you should have your own nephrologist team to tell you what is going on. What option of dialysis have you chosen? Do you have someone who can donate a kidney?
Sorry, but internet medicine is a dangerous thing. We can give you some personal info given our experiences if you have question.
Yes, your labs do change. But it is not a uniform process. I became anemic quite early, but my potassium stayed normal. My damaged kidneys were ok for filtering some things, but other things didn't work so well. That's why you have to have labs on a regular basis and why changes in your diet are based on labwork. I didn't have to give up phosphorus (dairy) until quite late in the process, but had to give up high potassium foods much earlier.
Every clinic is different. My nephrologists office sends patients for teaching when they reach 3.5. There is a 2 half day program that teaches about all the modalities and diet and lifestyle issues. Given where your creatinine is right now, it's probably too early as it will most likely be many years before you require dialysis and if you get teaching now, it will probably be out of date by then.
While I delayed too long, my creatinine was about 10 before I went on dialysis.