亚洲国产精品成人综合久久久久久久久精品免费看片国产欧美久久久久久精品一区二区三区_成人精品一区二区91毛片不卡_99久久精品无码一区二区毛片免费_亚洲国产成人精品女人久久久国产美女久久久_一本色道久久综合精品免费_久久久久久一级毛片免费野外黑人_免费欧美日韩精品一区二区三区||www.77wy.cn,久久香蕉成人免费大片,亚洲国产成人久久一区久久,4399视频手机在线观看免费,国产精品亚洲综合色区,亚洲欧洲自拍偷线高清一区二区||www.crgt.net.cn ,久久久久成亚洲综合精品,久久久久久无码国产精品中文字幕,国产黄a一级二级三级看三区,91精品国产综合久久久久久,国产欧美日韩精品一区二区三区蜜桃不卡||www.szchenchen.cn ,久久发布国产伦子伦精品,国产高清午夜精品福利色噜,91偷拍一区二区三区精品,日本XXXXX黄区免费看||www.mkznxc.cn

A vacutainer blood collection tube is a sterile glass tube with a colored rubber stopper creating a vacuum seal inside of the tube facilitating the drawing of a predetermined volume of liquid.
Vacutainer tubes may contain additives designed to stabilize and preserve the specimen prior to analytical testing. Tubes are available with a safety-engineered closure (rubber stopper), with a variety of labeling options and stopper colors as well as a range of draw volumes.

The purple top tube became an issue in the O.J. Simpson murder case when the defense alleged that small droplets of blood found at the crime scene contained the preservative EDTA. Had this been true, it would have meant that the droplet might have been taken from the purple top tube used to collect Simpson's blood and planted at the crime scene.

Drawing blood using a vacutainer. The clear plastic sheath around the top of the tube holds the needle. The orange guard will shield the needle after it is withdrawn from the patient to protect from accidental needle sticks.

Vacutainer needle are double ended, with one side being encased in a thin rubber coating for safety. When the needle is screwed into the translucent plastic needle holder, the rubber needle is inside the holder, and the exposed needle will be inserted into the vein. When a Vacutainer tube is inserted into the holder, its rubber cap is punctured by the inner needle and the vacuum in the tube pulls blood through the needle and into the tube. The filled tube is then removed and another can be inserted and filled the same way. The amount of air evacuated from the tube predetermines how much blood will fill the tube before blood stops flowing.