sealingly closing the blood microcollection container 112 in the assembly 100 also once cap 106 is opened the lancet 116 is exposed for use at the same end as the blood microcollection tube 112 thus the user grasps housing 102 and places the front end 113 of lancet 116 against the patient 39 s skin and presses the assembly 102 toward the patient this causes wall portion 114 of assembly 102 to move forward and press against top 115 of lancet body 116 again as discussed previously this action causes the cooperating abutments of lancet 116 to move past each other to force the lancet blade into the patient 39 s skin for a rapid puncture movement once this happens the user removes housing 102 from adjacent the patient 39 s skin which causes the spring of the lancet 116 to retract the blade thereof then the user may simply place the front end of the blood microcollection tube 112 against the wound for collecting several drops of blood into blood microcollection container 112 for subsequent examination then cap 106 may be single handedly reclosed over the entire assembly for ensuring no exposure of the blood sample until it is examined in the laboratory lip 119 facilitates the unsnapping of cap 106 for un covering the assembly 102 around hinge 110 referring to the embodiment of fig5 the assembly 120 shown therein is similar to that of fig4 in the sense that.