Problem: The nurse is assessing the abdomen of a 5-year-old child who is underweight. Which finding prompts the nurse to notify the healthcare provider immediately? The nurse is assessing the abdomen of a 5-year-old child who is underweight. Which finding prompts the nurse to notify the healthcare provider immediately? The umbilicus is flat. The skin covering the abdomen is taut. Peristaltic waves are visible through the abdominal wall. The abdomen is tense, similar to a board.