Correct Answer: C

Rationale: Withdrawing and discarding a sample equal to the amount of fluid in the device ensures that the blood drawn is not diluted by the IV fluids, providing accurate lab results.

Correct Answer: C

Rationale: Aspirating urine from cotton balls inside the diaper is a minimally invasive method and effective for collecting small amounts of urine. Using a collection bag can be more cumbersome, and other methods are not as effective for this age.

Correct Answer: B

Rationale: The correct answer is B: Associative. Associative play is common in preschoolers, where children engage in separate activities but interact by sharing toys and talking with each other. This stage is characterized by more social interaction than solitary play (option A), where children play alone without interacting with others. Cooperative play (option C) involves children working together towards a common goal, which is typically seen in older children. Parallel play (option D) is when children play alongside each other but do not actively engage with one another, which is more common in toddlers.

Correct Answer: D

Rationale: Facial expression has consistently been validated as an indicator of pain in infants. Behavioral pain measures are most reliable for sharp procedural pain in infants. Increased heart rate and respirations are indicative of a generalized and complex response to stress, not specific for pain in infants. Thrashing of arms and legs is a reliable indicator in young children, not specifically in infants.

Correct Answer: C

Rationale: These symptoms are indicative of dehydration or water depletion, which is common in infants and can rapidly lead to severe consequences if not addressed promptly.