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 instruction is often associated with patients who have a shunt, a limb with an established intravenous line, or another condition, but it is not specific to Wilms' tumor. B. Do not palpate abdomen is correct. Wilms' tumor is a type of kidney cancer in children, and the tumor is often palpable in the abdomen. Palpating the abdomen could cause the tumor to rupture, leading to the spread of cancerous cells. To avoid this risk, the abdomen should not be palpated. C. Collect all urine is incorrect. While urine collection might be necessary for monitoring renal function or assessing signs of metastasis, it is not a standard precaution or warning for a child with Wilms' tumor. D. Contact precautions is incorrect. Wilms' tumor is not contagious, so contact precautions are not required unless there is a coexisting infectious condition.