Hello and welcome to HCM.
As an
Urologist,i can understand your concern.
You've not mentioned his medication. Patient's with kidney failure need :
1. blood routine,
creatinine,RBS,uric acid,LFT,electrolytes,PSA and platelets.
2.
Ultrasound scan abdomen.
Severity of kidney failure,is done by checking creatinine and electrolytes.
Most probably,he may be falling,due to electrolyte disequilibrium.
It could also be due to lowering of B.P.,in case he's on
dialysis.
If you've any doubts,you may send all reports to me,as a direct question.
Dr.Matthew J. Mangat.