Difficulty: Easy

Average Score: 90%

Which of the following actions should a medical assistant take when performing a capillary puncture?

Rationale

Puncture parallel to the fingerprint.

When performing a capillary puncture, it is essential to puncture parallel to the fingerprint lines to minimize trauma to the tissue and ensure a smooth flow of blood. This technique helps to promote effective blood collection while preserving the integrity of the skin.

A (Wipe away the first five drops of blood after puncturing.) YOUR ANSWER

Wiping away the first drops of blood is not a standard practice during capillary puncture. In fact, the first few drops may contain tissue fluid, which can dilute the sample. Instead, it's preferable to allow the first drop to form naturally and collect the following drops to ensure accurate results.

B (Apply even pressure to the finger during the collection.) YOUR ANSWER

While applying gentle pressure can help facilitate blood flow, it is crucial not to apply excessive pressure, as this can cause hemolysis or contamination of the sample. Proper technique involves puncturing the skin and allowing gravity to assist in blood collection rather than relying solely on pressure.

C (Puncture the index finger at the tip.) YOUR ANSWER

Puncturing the finger at the tip is not recommended, as it can cause excessive pain and damage to the delicate tissues. The side of the fingertip, or the fleshy part of the finger, is preferred to minimize discomfort and provide a better sample without harming the area.

Conclusion

The correct technique for a capillary puncture involves puncturing parallel to the fingerprint lines, which optimizes blood collection while reducing tissue trauma. Incorrect practices, such as wiping away initial drops, applying uneven pressure, or puncturing inappropriate areas, can compromise sample integrity and patient comfort. Adhering to proper procedures ensures reliable results and enhances patient care.

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