VO2 Max Test and a Trainer Road workout

I’m signed up for a VO2 max test this coming Saturday along with a DEXA scan. My training plan has me doing a VO2 Max workout (Mist +3, 90 minutes). Should I do the scheduled workout after the VO2 max test or opt for an alternate workout? If an alternate, I’d like to get some guidance on which workout to pick in lieu of Mist. Thanks