A nurse is caring for a 6-month-old child. The child's provider has ordered a diphtheria, tetanus, and pertussis (DTaP) vaccine to be administered. Which of the following should cause the nurse to question the administration of this vaccine?

A. Keep the client's leg in a dependent position. Keeping the leg in a dependent position can increase swelling and delay healing. The leg should be elevated to reduce swelling and promote circulation.

B. Use a hair dryer on a hot setting to dry the cast. Using a hair dryer on a hot setting can cause burns and does not effectively dry a plaster cast. Plaster casts take time to dry and should be air-dried naturally.

C. Discourage the client from ambulating: Early mobilization is encouraged to prevent complications like muscle atrophy and joint stiffness, as long as it is safe and the healthcare provider has approved it. Completely discouraging ambulation is not generally recommended unless specified by a doctor.

D. Perform a neurovascular check of the lower extremities. Neurovascular checks are essential to ensure that there is adequate blood flow and nerve function below the cast. This includes checking for pain, pallor, pulse, paresthesia, and paralysis (the 5 P’s). This helps detect complications like compartment syndrome or decreased circulation early.

A. Determine if the toddler is voiding: Assessing urine output is crucial for determining the child’s hydration status. Voiding is an important indicator of kidney function and fluid balance. Ensuring the child is voiding can help determine the severity of dehydration and guide further interventions.

B. Request evaluation of the toddler's serum electrolytes. Evaluating serum electrolytes is important for understanding the extent of dehydration and electrolyte imbalances. However, it is not the immediate first action and should follow the initial assessment of the child's hydration status.

C. Initiate isotonic fluids with 20 mEq/L potassium chloride. Initiating fluid therapy is crucial but should only be done after assessing kidney function through urine output and evaluating the need for potassium supplementation to avoid complications like hyperkalaemia if the kidneys are not functioning properly.

D. Collect a stool sample from the toddler. Collecting a stool sample is useful for diagnosing the cause of gastroenteritis, but it is not the immediate priority. The focus should first be on assessing hydration status and initiating appropriate fluid therapy.