i have no idea with kind of blood work your doctor has ordered. you do have a right to know so you will need to ask your doctor or the lab. the code you have listed is a diagnosis code not a type of blood test. usually when they order labs with "long term drug use" as the reason it is because you're on a medication that has possible side effects & they're checking for those (which they should do). for example patients on amiodarone have their liver function checked annually. they aren't saying you're using recreational/illegal drugs. sounds like checking to see how far back your drug use if any is. but i thought that was with hair follicles they can go back for a certain time. i am not sure if they now have a blood test to do that which they probably do.
again my dr. is sending me for blood work one test says v58. 69 long term drug use. what is this test looking for? . i am asking because i do not use narcotics or pain killers and it reads like i am a drug user?