The reason you are having problems finding information is because the lab you are using is using umol/L measurments instead of mg/dl. The mg/dl is commonly used in the US so I don't know if you are in another country or maybe your dad is in another country. The link posted above is a measurment converter. I put your dads number of 793 in the calculater and it came back 8.9 (Normal levels in mg/dl are .5-1.2 for men)
This is a very high creatinine. When I started dialysis last year, my creatinine was at 6.1 and then quickly went up after starting. I know have a creatinine of 13 all the time. (I have chosen to do peritoneal dialysis at home) But it really depends on how symptamatic your dad is showing. When I started I was becoming very confused, vomiting, nausea, couldnt keep my pills down, fatigued, and dizzy.
Is your dad considering dialysis? It reallly isnt as bad as people think but it is life changing. I would be more than happy to answer any questions you have based on my experiences, if you have any!!!
dialysis from lupus nephritis