Final answer:
The nurse should immediately consult the health care provider if the client with Crohn's disease and colonic strictures presents with a distended abdomen, as it may indicate a serious complication such as a bowel obstruction.
Step-by-step explanation:
The assessment finding that requires the nurse to consult the health care provider immediately for a client with Crohn's disease and colonic strictures is B) Distended abdomen.
An abdomen that is distended can indicate a possible bowel obstruction or other serious complication that may arise with Crohn's disease. Such a presentation requires prompt medical attention to prevent further complications. Other symptoms like traces of blood in the stool (A), a mild temperature (C), and crampy lower abdominal pain (D) are concerning but are often common findings in Crohn's disease. A distended abdomen could suggest an acute complication that necessitates urgent evaluation and management to prevent further deterioration of the patient's condition.