Difficulty: Medium

Average Score: 66%

Which of the following actions should a phlebotomist take when collecting a specimen for a newborn screening

Rationale

Wipe away the first drop of blood.

When collecting a specimen for newborn screening, it is essential to wipe away the first drop of blood, as it may contain tissue fluids that can affect test results. Ensuring a clean sample helps to achieve accurate and reliable screening outcomes.

A (Wipe away the first drop of blood) CORRECT

This action is important because the first drop of blood can contain contaminants and interstitial fluids that may interfere with the test results. By discarding this initial drop, the phlebotomist ensures that the subsequent blood sample collected is more representative of the infant's blood and free from potential contaminants.

B (Allow the card to dry in a vertical position) YOUR ANSWER

Drying the card in a vertical position is not recommended because it can lead to uneven drying and possible pooling of blood, which may affect the sample quality. The card should be laid flat to promote even drying and better preservation of the blood spots for accurate analysis.

C (Smear the blood on the spot collection card) YOUR ANSWER

Smearing the blood can create a thin layer that may not adequately absorb into the card, leading to inadequate samples for testing. Instead, blood should be applied as drops to ensure that it is properly absorbed and preserves the integrity of the specimen for accurate testing.

D (Use a capillary tube for collection) YOUR ANSWER

While capillary tubes can be used in certain situations, standard newborn screening typically involves collecting blood spots directly onto a collection card from a heel puncture. Using a capillary tube may not be the preferred method, as it can complicate the collection process and may not yield sufficient sample volume for testing.

Conclusion

In newborn screening, proper specimen collection techniques are crucial for accurate test results. Wiping away the first drop of blood is essential to eliminate contaminants, while other methods like using a capillary tube or improper drying positions may compromise sample quality. Adhering to correct procedures ensures reliable screening outcomes that are vital for newborn health assessments.

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