Difficulty: Medium

Average Score: 70%

Which of the following is an appropriate action by the phlebotomist when performing a fingertip capillary puncture

Rationale

Puncture perpendicular to the grain of the fingerprint.

When performing a fingertip capillary puncture, it is essential for the lancet to puncture perpendicular to the grain of the fingerprint to ensure an adequate blood flow and minimize the risk of tissue damage. This technique allows for better access to the capillaries, facilitating a more efficient blood collection process.

A (The lancet should penetrate less than 1 mm) YOUR ANSWER

A penetration depth of less than 1 mm is insufficient for a proper capillary puncture. While the goal is to minimize discomfort, a depth that shallow may not reach the capillary network, resulting in inadequate blood flow or failure to collect a sample.

B (Puncture parallel to the grain of the fingerprint) YOUR ANSWER

Puncturing parallel to the grain of the fingerprint is not advisable as it does not effectively access the capillary network. This approach can lead to a poorer blood sample and may cause more trauma to the tissue, resulting in complications like bruising or hematoma.

D (The lancet should penetrate greater than 3 mm) YOUR ANSWER

A penetration depth greater than 3 mm is excessive for a fingertip capillary puncture and poses a significant risk of injury to deeper tissues and nerves. This depth increases the likelihood of discomfort and complications, making it an inappropriate technique for blood collection.

Conclusion

In summary, the correct technique for performing a fingertip capillary puncture involves puncturing perpendicular to the grain of the fingerprint. This method ensures optimal access to capillaries, enabling effective blood collection while minimizing discomfort and potential complications. Proper training and adherence to these guidelines are crucial for phlebotomists to ensure patient safety and successful sample acquisition.

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