Final answer:
Reasonable Efforts is the standard that mandates child welfare professionals to exhaust all suitable options to prevent the removal of a child from their home, aiming to keep the family unit intact.
Step-by-step explanation:
The requirement for a child welfare professional to take all reasonable actions to prevent the removal of a child from the home before such a removal occurs is known as Reasonable Efforts. This legal standard mandates child welfare professionals to actively work towards keeping the family intact by providing supportive services, interventions, and alternatives to out-of-home placement. It is only when these efforts fail, and there is a consideration of the child's immediate safety, that removal might be considered as a last resort according to the policies established to protect children's wellbeing within the jurisdiction.