23. When a phlebotomist performs a heel stick for the purposes of obtaining a PKU test, it is important to
Answer: B
Wipe away the first drop of blood.
Wiping away the first drop of blood during a heel stick is essential because the initial drop may contain interstitial fluid that can dilute the sample, leading to inaccurate test results, particularly for a PKU test.
A) Wrap the site with a heel warmer for 30 min.
While warming the heel can facilitate blood flow, it is not a critical step specifically required for the accuracy of a PKU test. Thus, this option does not address the significance of the first drop of blood and is not the correct answer.
B) Wipe away the first drop of blood.
This option is correct because it prevents contamination of the sample with interstitial fluid, ensuring that the blood collected is a true representation of the infant's metabolic state. This practice is vital for the accuracy of the PKU test results.
C) Keep a pressure dressing on the site for the day.
Applying a pressure dressing for an extended period is unnecessary and could cause discomfort or complications. This option does not relate to the proper technique for obtaining an accurate PKU test sample.
D) Target the central arch area of the foot for the least amount of discomfort.
Although selecting an appropriate site for a heel stick can minimize discomfort, the primary focus during the PKU test should be on ensuring the quality of the blood sample. Therefore, this option does not address the critical action of wiping away the first drop of blood.
Conclusion
Wiping away the first drop of blood is the crucial action needed to ensure the accuracy of a PKU test, as it prevents potential contamination that could skew results. Other options either do not directly contribute to the quality of the blood sample or are unnecessary for the procedure. Thus, option B stands out as the definitive correct choice.