Most centers run their dialysate at 200 mg/dL of glucose, so your blood glucose will be moderated by the dialysate. Highs and lows that require action are rare while on in center dialysis.
That depends on your blood sugar control. If it shoots all over the place on a regular basis, it's going to do so while you are on dialysis. If it's normally pretty stable, then dialysis isn't going to affect it much.I always eat before I go - not a huge meal, but a sensible one. I always bring a snack. I'm on at 6 am, and if I don't eat something around 8, I crash by 9. Crashing while hooked up is a pain. It's very difficult to tell blood sugar symptoms from blood pressure symptoms, and my dropping blood sugar can sometimes make my blood pressure crash at the same time, even when it's not a issue with fluid removal. I have a bag of smarties with my dialysis kit. They dissolve easily, and work just as well as glucose tablets, only they taste better. My unit does not have a glucose meter, so I carry mine with me at all times. Go prepared, and check your sugar every hour the first few runs, until you get an idea how you are going to react. Bring a snack that won't upset your stomach. I usually take some kind of cracker, and some dried fruit. (My potassium is usually low, so the dried fruit isn't a bad choice for me.) Those little applesauce cups are easy to take along, too.Even if the center has no-snack rules, they should let a diabetic eat if they need to!Good Luck!