Does an adult nurse take blood and carry out iv cannulations?

they do what the dr has ordered for you as your nurse they basicly carry out what the dr instructs them to take care of they can take blood and carry out cannulations as prescibed by a dr this allows them to carry out the specifics that are ordered or they can find someone who can carry out those orders why the main nurse does other things she or he has been instructed to do and see through