Final answer:
The characteristic that leads a nurse to suspect intussusception is the presence of currant jelly-like stool.
Step-by-step explanation:
The characteristic of a child's stool that may lead a nurse to suspect intussusception is the presence of currant jelly-like stool. Intussusception is a condition in which one part of the intestine slides into another part, causing a blockage. When this occurs, blood and mucus can accumulate in the affected area, resulting in the passage of stool with a jelly-like consistency and a characteristic red or maroon color.