Blood Collection and Preservation
Blood is a body fluid containing plasma, red blood cells (RBCs), white blood cells, and platelets. Blood is specialized for performing various functions such as transport of nutrients and oxygen to various body organs, transportation of antibodies, transport of waste products to kidneys, and regulation of body temperature. Normally, blood pH is maintained in narrow range of 7.35–7.45. Blood for biochemical investigations may be drawn from arteries, veins, or capillaries. Blood is collected in various collection tubes called vacutainers which are sterile glass tubes with a colored rubber stopper. Blood contains various chemical constituents such as glucose, proteins, lipids, globulin, fibrinogen, urea, amino acids, uric acid, creatinine, hormones, vitamins, electrolytes, etc..