Difficulty: Easy

Average Score: 89%

Which of the following lancet positions should a phlebotomist use for a capillary blood collection on a healthy adult patient?

Rationale

Perpendicular to the fingerprint grooves is the appropriate lancet position for capillary blood collection.

Positioning the lancet perpendicular to the fingerprint grooves allows for optimal blood flow and minimizes the risk of tissue damage. This technique ensures that the incision is made across the grooves, facilitating a better sample collection while reducing pain for the patient.

A (Perpendicular to the fingerprint grooves) CORRECT

This position is ideal as it aligns the lancet with the natural flow of blood, enhancing collection efficiency. By cutting across the grooves, the lancet can effectively access capillary blood vessels, leading to a more successful sample retrieval.

B (Parallel to the nail bed of the first digit) YOUR ANSWER

Placing the lancet parallel to the nail bed is not recommended as it does not facilitate proper blood flow. This position may lead to less effective puncture sites, resulting in insufficient blood collection and potentially causing more discomfort for the patient.

C (Along the lateral portion of the first digit) YOUR ANSWER

Using this position could risk hitting deeper tissues or nerves, increasing the chance of pain or injury. Lateral punctures do not provide the optimal angle for accessing capillary blood, thus compromising the quality of the sample collected.

D (Along the medial portion of the fifth digit) YOUR ANSWER

While this option suggests a site on the fifth digit, it is not the preferred site for capillary collection in adults. The medial portion of the fifth digit is not as effective for blood flow and may lead to improper sample collection due to the anatomical structure of the digit.

Conclusion

For capillary blood collection on healthy adult patients, the lancet should be positioned perpendicular to the fingerprint grooves. This method maximizes blood flow and minimizes discomfort, ensuring an efficient and effective sampling process. Incorrect positions can lead to inadequate blood collection or increased patient pain, underscoring the importance of proper technique in phlebotomy.

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