The mother of a 4-year-old client tells the pediatric nurse that the child's abdomen seems to be swollen. During further assessment, the mother tells the nurse that their child is eating well and that their activity level is unchanged. The nurse, suspecting the possibility of Wilms tumor, should avoid which action during the physical assessment?

The correct answer is D: Palpating the abdomen for a mass. Palpating the abdomen in a child suspected of having Wilms tumor can potentially cause the tumor to rupture and spread. It is crucial to avoid palpation to prevent any complications. Monitoring temperature for fever (A), blood pressure for hypertension (B), and assessing urine for hematuria (C) are important assessments in the context of Wilms tumor. Fever may indicate infection, hypertension can be a sign of tumor-related conditions, and hematuria can be a symptom of the tumor. Therefore, these actions are relevant in the assessment of a child suspected of having Wilms tumor.