Difficulty: Hard

Average Score: 48%

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 optimal lancet position for capillary blood collection.

This positioning allows for maximum blood flow and minimizes the risk of hemolysis, ensuring a more effective and efficient capillary blood sample collection. By cutting across the fingerprint patterns, the lancet can access a larger capillary network.

A (Perpendicular to the fingerprint grooves) CORRECT

Using the lancet perpendicular to the fingerprint grooves is ideal because it allows for optimal access to the capillaries without obstruction. This technique enhances blood flow and reduces the likelihood of damaging the blood cells, leading to a better quality sample.

B (Parallel to the nail bed) YOUR ANSWER

Positioning the lancet parallel to the nail bed may lead to inadequate puncture depth and reduced blood flow. This approach can also cause discomfort to the patient, as the angle may not effectively penetrate the skin layers where capillaries reside.

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

While this position might access some capillaries, it is not optimal for capillary blood collection. The lateral aspect may have fewer capillary networks compared to other areas, potentially leading to insufficient blood yield and a less accurate sample.

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

Using the medial portion of the fifth digit is not recommended as it is further from the central capillary network typically found in the pads of the fingers. This position may also increase the risk of hitting bone or causing unnecessary pain to the patient.

Conclusion

For capillary blood collection in healthy adults, the lancet should be applied perpendicularly to the fingerprint grooves. This technique maximizes blood flow and minimizes complications, ensuring an efficient and comfortable experience for the patient. Other positions may compromise sample quality or patient comfort, underlining the importance of proper technique in phlebotomy practices.

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