I have had a blood transfusion within the past week because i had a virus, I have a hair follicle test coming up this month witch i get done every 3 months. If the person who donated blood to the hospital had done drugs will it show up on a hair follicle test when i get my test? because if they screen for narcotics through blood or urine it only shows up for 3 weeks max. can it transfer into my blood and show up on a hair follicle test?