If there is blood in the line, you will need to flush the catheter sooner with 20 ml of normal saline. <B>You will need to use two 10 ml normal saline syringes and two alcohol pads</B>. You must flush your catheter using the start and stop method. The start and stop method is when you start pushing the saline into the catheter and then stop. Push 1 ml, and then stop. <B>Repeat this giving 1 ml at a time until both syringes are given.</B>