Question 53

The phlebotomist should use a lancet positioned perpendicular to the fingerprint grooves for capillary blood collection.

Using a lancet perpendicular to the fingerprint grooves ensures optimal blood flow and minimizes the risk of tissue damage, making it the best practice for capillary blood collection in healthy adults.

A) Perpendicular to the fingerprint grooves

This option is correct as positioning the lancet perpendicular to the fingerprint grooves allows for easier access to capillary blood and promotes effective blood flow, which is critical during a capillary blood collection.

B) Parallel to the nail bed

This option is incorrect because using a lancet parallel to the nail bed does not align with the natural orientation of capillaries, potentially leading to inadequate blood flow and ineffective collection.

C) Along the lateral portion of the first digit

This option is incorrect as it does not follow the recommended technique for capillary collection. The lateral portion may not provide sufficient access to the capillary network compared to the perpendicular approach.

D) Along the medial portion of the fifth digit

This option is also incorrect, as the medial portion of the fifth digit is not a standard site for capillary blood collection. The position does not facilitate optimal blood flow or access to the capillaries.

Conclusion

The correct answer, positioning the lancet perpendicular to the fingerprint grooves, is essential for effective capillary blood collection, as it ensures proper access to blood vessels and minimizes patient discomfort. All other options fail to adhere to best practices for capillary sampling, which can compromise the quality of the collected sample.