I smoked weed for the second timetook three hits will it show up in a routine blood test i have to get soon and if so will they tell myparents i'm 16?

"Soon" 's unspecific: Depends on when the test is. It might if the test is very soon. The range is wide - strength of the weed, your body, etc The word is 5 - 18 days until clear. Feel lucky? Also depends on who they are and how your parents are connected. Don't do it if it's illegal since your future can really be impacted by a criminal record. It matters. I wish you well. But pledge to be careful.