Question 37

The medial or lateral areas of the heel are the best site for phenylketonuria collection on an infant.

The best site for phenylketonuria collection in infants is the medial or lateral areas of the heel, as these locations are specifically recommended for heel sticks in young children due to their accessibility and safety.

A) The medial or lateral areas of the heel

This option is correct because the medial and lateral areas of the heel are preferred sites for blood collection in infants. These areas minimize the risk of injury to underlying structures and allow for effective blood sampling, making them ideal for procedures such as phenylketonuria testing.

B) The central area of the heel

This option is incorrect because the central area of the heel is not recommended for blood collection in infants. Collecting blood from the central area could potentially damage deeper tissues and nerves, increasing the risk of complications.

C) The medial or lateral area of the fingertip

This option is also incorrect. While the fingertip is used for blood collection in older children and adults, it is not suitable for infants due to their smaller size and the risk of injury. Infants are better served with heel sticks.

D) The central area of the fingertip

This option is incorrect as well. The central area of the fingertip poses similar risks as the central heel area. Using this site on infants can lead to complications and is not a standard practice for blood collection.

Conclusion

In summary, the medial or lateral areas of the heel are the safest and most effective sites for phenylketonuria blood collection in infants, reducing the risk of injury and ensuring adequate sample collection. All other options either pose greater risks or are not suitable for the infant population, thus reaffirming why Option A is the definitive choice.