I know cherukkan all tests dont need fasting but u never know what ur doctor has added up in the list without ur knowledge, specially in this part of world( may be language problem) and wrong results can lead to wrong diagnosis and wrong medicine.
and why a person who dont even know u, will tell u something wrong ,may be bc he is overworked, still better to come back next time when he is fresh and can do ur work better,After all he is a human and can be tired.:)