Puncture Site for a Capillary Blood Sample in Infants (TMC Practice Question)

3 years ago
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What is the correct puncture site for a capillary blood sample in infants? Watch this video where we break down a TMC Practice Question.
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💥Neonatal [TMC Practice Questions] ➜ ➜ ➜ https://bit.ly/3i49mrB

➡️ An arterial blood gas sample has been ordered for a newborn infant and the physician has specifically requested arterialized capillary blood. Which of the following is the best site to obtain the sample?
A. The fingertip
B. The tip of the toe
C. The lateral area of the heel
D. The earlobe

➡️ Rationale
To get this one correct, you simply just needed to know that the lateral area of the heel is the preferred puncture site when collecting a capillary sample in an infant. You could potentially use the infant’s fingertip, toe, or earlobe if the lateral heel puncture is unsuccessful, but these are not the preferred sites. The heel is the preferred, and typically most effective, site to stick in infants. Also, note that after you puncture the heel, you should wipe away the first drop of blood and observe for free flow before collection. You do not need to squeeze or milk the puncture site.

➡️ Here’s another important thing to remember:
Capillary samples are useful only for assessing the infant’s acid-base status — not their oxygenation status. The pH and PaCO2 correlate well with arterial blood, however, the PaO2 does not.

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🚑MEDICAL DISCLAIMER
Medicine and Respiratory Therapy are continuously changing practices. The information in this video is for educational and entertainment purposes only. For medical advice, please consult with a physician or qualified medical professional.

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⏰TIMESTAMPS
0:00 - Intro
0:35 - Practice Question
1:00 - Explanation
2:28 - Correct Answer

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