Blood Collection Tube

Products - Venous Collection
BD Vacutainer® Blood Collection Tube Product Ordering Information

[Vacutainer_tube_guide_2006.pdf]

blood composition

In vertebrates it is composed of blood cells suspended in a liquid called blood plasma. Plasma, which comprises 55% of blood fluid, is mostly water (90% by volume), and contains dissolved proteins, glucose, mineral ions, hormones, carbon dioxide (plasma being the main medium for excretory product transportation), platelets and blood cells themselves. The blood cells present in blood are mainly red blood cells (also called RBCs or erythrocytes) and white blood cells, including leukocytes and platelets (also called thrombocytes).

血漿是血液除去血細胞後的成分。其組成絕大部分是水，其次是各種血漿蛋白。血漿和血清的唯一區別是血清中不含纖維蛋白原。

Two tubes of EDTA anticoagulated blood.
Left tube: after standing, the RBCs have settled at the bottom of the tube.
Right tube: contains freshly drawn blood.

text and picture taken from wikipedia: blood