Water closets a few inches above the concrete, sink, lavatory, and laundry drains and vents ~24" above. The only time I terminate flush with concrete is in types of construction that utilize rollout forms for pouring upper floors.
Under slab rough-in can seem deceptively simple, but it is really easy to screw up. And with layoffs rampant in building departments as local governments try to balance their budgets, don't count on the inspector to catch every issue. If you have a question, do not hesitate to ask us.