The tubes are specially used for blood specimen’s collection and anti-coagulation while testing the sedimentation speed of red blood cell on Westergren method.

The tubes are used for mating with many brands of full automatic ESR.As the little blood taking.small negative pressure in the rube ,the blood taking time is comparatively longer.do patient to wait till the blood stop flowing to the blood collection tube.Then mix it 5-8 times to make the anticoagulant agent and blood mix completely.Inappropriate mixing will cause menolysis,blood clotting or blood bubble.AAffect the result of the test.