What action should be taken if a hematoma develops quickly during a venous draw?

When a hematoma develops quickly during a venous draw, stopping the blood draw and releasing the tourniquet is the appropriate action. A hematoma occurs when blood leaks from the blood vessel into surrounding tissues due to trauma, often exacerbated by continued manipulation of the needle or vessel. By stopping the procedure and applying direct pressure to the site, the risk of further bleeding into the surrounding tissue can be minimized. Releasing the tourniquet further helps improve blood flow and allows for better assessment of the situation. This prevents additional damage and provides an opportunity to address any complications before proceeding with further steps, such as applying a dressing or evaluating whether a different site for draw may be necessary.