How do you time 24-hour urine collections when calculating creatinine clearance for patients receiving thrice-weekly hemodialysis?  

Great question. I think no matter how one does it there is bound to be some inaccuracies but it would still be helpful. My routine is to do the urine collection starting the morning after dialysis and ending the morning of dialysis. Then to check serum creatinine before dialysis. Of course, the seru...

Timing does not matter as long as fairly complete and start/stop times are known you can always play with numbers. Na Creatinine excretion is more important than Urea.