Final answer:
For a patient with serous fluid discharge after laparotomy, the next step is to examine the wound for separation to determine if immediate intervention is needed.
Step-by-step explanation:
In the case of a 52-year-old man experiencing pink, serous fluid discharging from his wound after a laparotomy for perforated bowel, the next most appropriate management step is to examine the wound for separation. Serous discharge can be a normal part of the healing process, but if it is associated with wound dehiscence (separation), this may indicate a need for immediate intervention. Further management, such as administering IV antibiotics, may be necessary if an infection is confirmed. A CT scan or inserting a drain may also be considered based on the wound's condition and the presence of any additional complicating factors such as infection or abscess.