Do you recommend CBD cessation prior to screening of liver enzymes?  

CBD increases liver enzymes. In a study, it took 1-2 weeks to normalize after cessation. Would recommend ideally 2 weeks, but a minimum of 1 week to remove the noise caused by CBD that may lead to an extensive and possibly unnecessary workup.

Always better to start clean but a lot depends on the amount and duration of use CBD stays for a long time in fat cells. 1-2 weeks for most patients is reasonable.