contracting the volume of the cavity 132 of the syringe 130 thus the components of the system 100 through which blood may have passed are flushed with the saline solution and communication between the solution inlet port 113 and the catheter port 117 can be restored block 370 in certain cases such as for neonatal patients or small infants the amount of blood to be drawn is relatively small for such cases it may be desirable to draw as little clearance fluid as possible in this regard the embodiment illustrated in fig2 may be used the first sampling site 120 may be used to draw clearance fluid and the second site 160 may be used to draw a clean blood sample the clearance fluid may then be returned to the patient and the syringe or cannula used for the clearance fluid can be disposed the syringe 130 mounted on the axial port 111 of the stopcock 110 can be used to infuse a small volume of flush fluid into the tubing between the stopcock 110 and the patient the saline port 115 may be used only occasionally to re supply flush fluid to the syringe 130 an embodiment of such a method is illustrated in fig4 referring now to fig4 a method of using the blood sampling kit incorporated into the embodiment illustrated in fig2 will be described the process 400 begins by drawing saline trough the saline port 115 into the syringe 130 block 410 this is achieved by positioning the lever 119 to be aligned with the saline port 115 and expanding the volume of the cavity 132 of the syringe 130 sufficient saline may be drawn into the syringe for multiple flushes accordingly if sufficient saline exists in the syringe from a.