marijuana showing up on other blood tests

im worried about some people i know who get alot of blood work done; if they r getting tested for a blood level of depakote; would marijuana show up?

[JDRF Volunteer SG]

I do know that marijuana use shows up on some blood tests but it does depend on what the lab is looking for. I have no idea if this particular lab test would show marijuana use. Only the lab technicians at the exact lab who will be running the test would know the answer to this question, for different labs use different equipment and procedures.