A child is admitted with a suspected diagnosis of Wilms' tumor. The nurse should place a sign with which of the following warnings over the child's bed?

A. No venipuncture or blood pressure in left arm is incorrect. This is not a standard warning for a child with Wilms' tumor. The concern for venipuncture or blood pressure typically involves conditions like a dialysis access or a limb at risk, but it is not specific to Wilms' tumor. B. Do not palpate abdomen is correct. Wilms' tumor, a type of kidney cancer, can be palpated in the abdomen. However, palpating the tumor may increase the risk of spreading cancerous cells or causing trauma to the tumor site, so it is crucial to avoid palpation. C. Collect all urine is incorrect. While urine collection may be necessary for diagnostic testing, it is not a specific warning related to Wilms' tumor. This would be standard for other renal conditions but not directly related to Wilms' tumor. D. Contact precautions is incorrect. While contact precautions may be required for infections, Wilms' tumor itself does not require contact precautions unless there is an associated infection.