American Society for Clinical Pathology (ASCP) Histotechnician Certification Practice Exam

If minimal blood flow occurs after performing a finger stick, what should the phlebotomist do to improve blood flow?

1. Apply a warm compress

2. Milk the finger

3. Puncture deeper

4. Use a larger lancet

The correct answer is: Milk the finger

When minimal blood flow occurs after performing a finger stick, the best approach to enhance blood flow is to milk the finger. This technique involves squeezing the finger gently to encourage the movement of blood toward the puncture site, thus aiding in the collection of an adequate blood sample. It is important to apply this technique carefully to avoid contamination of the sample with tissue fluids, which can compromise the results of the test. Using a warm compress, while it can help dilate blood vessels and improve circulation, is not as effective in immediate blood flow improvement right after the stick. Similarly, puncturing deeper or using a larger lancet could lead to unnecessary pain and may not guarantee better or more sufficient blood flow, as the capillary beds are relatively superficial and might not yield more blood in these circumstances. Therefore, milking the finger is the most efficient and appropriate method to increase blood flow after a finger stick.