The results of the test mean the following: 1  a GFR of 60 or more is in the normal range. 2  a GFR of less than 60 may mean you have kidney disease. 3  a GFR of 15 or less is called kidney failure.
Family name is one that is shared with the family, but is not necessarily the surname. A good example to sum all this up would be the name of the main character of Kidnapped, David Balfour of the Shaws. His family name is the Shaws, but he is addressed as Mr. Balfour. His surname, in this case, is the same as his last name.
Last name is the name that comes after the first and middle names, and is used in titles i.e. Mr. last name or Miss last name. Although surname is generally understood as the last name, and used in titles, this is not necessarily so: Here's a definition of surname: a name added to a person's name, as one indicating a circumstance of birth or some characteristic or achievement; epithet.