NHA Phlebotomy Certification Practice Exam

Which of the following is NOT a cause of hematomas?

1. Having the patient bend the elbow

2. Inserting the needle partially into the vein

3. Drawing below an intravenous line

4. Removing the tourniquet after removing the needle

The correct answer is: Drawing below an intravenous line

The correct answer identifies a situation that typically does not lead to the formation of hematomas. Drawing blood below an intravenous line is generally not associated with hematomas because this action is more likely to result in the dilution of the blood sample due to the mixture of intravenous fluids. In this scenario, any potential complications or bruising would more commonly stem from the intravenous line itself or the condition of the vein being accessed, rather than from the drawing technique used. In contrast, the other situations listed can indeed contribute to hematoma formation. For instance, having the patient bend the elbow can create pressure on the vein, increasing the likelihood of a rupture and subsequent bleeding into the surrounding tissue. Inserting the needle partially into the vein may not secure the needle within the vessel fully, increasing the risk of tearing the vein wall. Similarly, if a tourniquet is left on for an extended time, it can cause blood to pool and increase pressure, which heightens the risk of a hematoma upon needle removal. Understanding these mechanisms helps in recognizing situations that can lead to complications during phlebotomy procedures and emphasizes the importance of proper technique and patient positioning.