Which of the following is a step of performing a venipuncture?
A Have the patient stand with their arm positioned slightly downward.
B Apply the tourniquet 3 to 4 inches above the antecubital.
C Cleanse the site with a 50% alcohol wipe.
D Insert the needle at a 5° to 10° angle.
The correct answer and explanation is:
The correct answer is B) Apply the tourniquet 3 to 4 inches above the antecubital.
Explanation:
When performing venipuncture, several steps must be followed to ensure proper technique, minimize patient discomfort, and avoid complications. Applying the tourniquet correctly is one of the first steps in preparing for venipuncture.
- Applying the Tourniquet:
The tourniquet should be applied approximately 3 to 4 inches above the antecubital area (the inside of the elbow). This helps engorge the veins, making them more visible and easier to access. It is important not to place the tourniquet too tight or leave it on for too long, as this can cause discomfort or affect blood flow. A good rule of thumb is not to leave it on for more than one minute to avoid hemoconcentration (the increase in the concentration of blood cells and proteins). - Patient Position:
Contrary to option A, it is best to have the patient sit or lie down with their arm extended horizontally or slightly downward to help the veins fill. Having the arm in a downward position is often more effective than having it angled upward, which could reduce blood flow to the veins. - Cleansing the Site:
A 70% alcohol wipe should be used to cleanse the venipuncture site, not 50%. The alcohol helps reduce the risk of infection by killing surface bacteria. After cleansing, it is important to allow the site to air dry before inserting the needle to avoid discomfort from the alcohol. - Needle Insertion:
The needle should typically be inserted at a 15° to 30° angle to the skin, not 5° to 10°. Inserting the needle too shallow can cause it to miss the vein, while inserting it too steeply can damage the vein and surrounding tissues.
By following these steps, venipuncture can be performed with greater accuracy, safety, and comfort for the patient.