American Medical Technologist (AMT) Practice Exam

What is the appropriate method for obtaining a blood sample from a dialysis patient?

1. Draw from a foot vein

2. Draw from a hand vein

3. Use a central line

4. Perform a finger stick

The correct answer is: Draw from a hand vein

For obtaining a blood sample from a dialysis patient, drawing from a hand vein is considered appropriate when no other access points are viable. The hand veins are typically easier to access, and this method minimizes the risk of complications associated with other access sites, such as the foot or central lines. Using a central line can be a method for obtaining blood, but it might not always be available or appropriate, particularly if the patient is not currently using the line for dialysis treatment. Additionally, central lines may have strict protocols and risk factors associated with their use, such as infection. Drawing from a foot vein generally presents higher risks. The veins in the feet can be more difficult to visualize and puncture, and accessing them can disrupt circulation or cause discomfort. Performing a finger stick may not provide an accurate reflection of the systemic blood levels as it samples from capillary circulation. This method is more suitable for quick checks or monitoring rather than for obtaining a sample for laboratory testing. Therefore, drawing from a hand vein is the standard practice, balancing effectiveness and patient safety for blood sampling in dialysis patients.