Difficulty: Medium

Average Score: 67%

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.

When performing a capillary blood collection, the lancet should be positioned perpendicular to the fingerprint grooves to ensure a clean puncture and optimal blood flow. This technique minimizes tissue damage and maximizes the chances of obtaining an adequate blood sample.

A (Perpendicular to the fingerprint grooves) CORRECT

Positioning the lancet perpendicular to the fingerprint grooves allows for a more effective puncture, as it aligns with the natural ridges of the skin. This method enhances blood flow and reduces the likelihood of hemolysis or inadequate samples, making it the preferred technique for capillary blood collection.

B (Parallel to the nail bed) YOUR ANSWER

Using a lancet parallel to the nail bed does not align with the skin's natural ridges, potentially leading to a less effective puncture. This position may also increase the risk of damaging surrounding tissues and could result in an insufficient blood sample, making it less suitable for capillary collections.

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

While the lateral portion of the first digit can be used for puncture, it is not the optimal position for capillary collection. This area may not provide a straight path for blood flow and could complicate the collection process, increasing the chance of complications or an inadequate sample.

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

The medial portion of the fifth digit is not commonly used for capillary blood collection, as it may lead to less effective punctures compared to the preferred sites. Additionally, this position could increase discomfort for the patient and reduce the ease of obtaining a quality sample.

Conclusion

The choice of lancet position is critical for successful capillary blood collection. The optimal method is to position the lancet perpendicular to the fingerprint grooves, which promotes better blood flow and minimizes complications. Other positions, while possible, do not provide the same advantages and may hinder the collection process or affect sample quality.

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