My grandma had renal failure. am i at risk for it?

Not likely: Unless she had a familial disease predisposing her to renal failure.If she had polycystic renal disease, diabetes, amyloidosis, sickle cell anaemia etc you could be at risk.How ever if it was the result of an acute illness it is very unlikely.

Genes and the kidney: Some diseases that cause kidney failure are genetic, polycystic kidney disease is one of them. Other diseases, such as diabetes, appear to have a strong familial tendency. With a history of kidney failure in your family, your doctor should be able to help you manage any problems that should arise. Clearly, if you have hypertension and/or diabetes, control of them will perserve your kidney function.