Question 29

Perpendicular to the fingerprint grooves

Using a lancet position that is perpendicular to the fingerprint grooves allows for optimal blood flow during capillary blood collection. This technique minimizes the risk of tissue damage and enhances the quality of the sample obtained.

A) Perpendicular to the fingerprint grooves

This option is correct because positioning the lancet perpendicular to the fingerprint grooves facilitates a clean and effective puncture. It ensures that the capillary vessels are adequately accessed, resulting in a better blood sample without excessive pain or complications for the patient.

B) Parallel to the nail bed of the first digit

This option is incorrect as it does not effectively penetrate the capillary network. Puncturing parallel to the nail bed can limit blood flow and may result in insufficient blood collection, making it an unsuitable choice for capillary blood collection.

C) Along the lateral portion of the first digit

This option is also incorrect. While puncturing along the lateral portion may seem viable, it can lead to inadequate blood flow and may not adequately target the capillaries, increasing the risk of a poor-quality sample.

D) Along the medial portion of the fifth digit

This option is incorrect as well. Puncturing along the medial portion of the fifth digit is not recommended because it is less effective for accessing the capillary network. It may lead to complications and an insufficient sample, making it an inappropriate choice for capillary blood collection.

Conclusion

The optimal method for capillary blood collection involves using a lancet positioned perpendicular to the fingerprint grooves, as this maximizes blood flow and minimizes discomfort. All other options fail to provide the same level of efficiency and safety, making them unsuitable for this procedure.