You can visually inspect them. You will see if they are worn. Also check the rubbers that hold the shocks on, top and bottom. The spring bushes have 2 metal sleaves with rubber inbetween, that rubber will have shrunk and look all old, or possibly seperated from the metal sleaves if they are worn. Use your own judgement tho, will be quite obvious. You will get a general idea of there condition without removing anything.