A
ABO blood group system
System used to group human blood into different types depending on the presence or absence of certain markers on the surface of the red blood cells. The four main blood types are A, B, O and AB.
Agglutination technique
Technique for pretransfusion tests based on the Ag-Ab reaction (antigens-antibodies), causing a given agglutination, which can then be observed to determine the blood type. This technique can be performed in a tube, a gel column or on microplates.
Blood agglutination
Antigens have the capacity to stimulate the immune system, triggering a response in the form of antibodies. This reaction determines compatibility between different blood groups. First, the antigen binds to the antibody. The antibodies then react to the appearance of contrary antigens, causing the red blood cells to form clumps or agglutinate.
Gel column agglutination technique
Agglutination technique to determine blood groups and for transfusion compatibility studies, which uses gel as a reagent. This gel sits in columns on cards of 6 to 8 wells.
Albumin
Plasma protein fraction commonly used as a macromolecular medium in the incubation of laboratory tests, reducing what is known as the "zeta-potential". As a hemoderivative, it is used as a plasma volume expander and for protein replacement in some cases.
Amino acid
Organic chemical substance that is the basic component of proteins. Amino acid solutions are one of the components of parenteral nutrition mixtures and must be administered in combination with appropriate quantities of energy preparations for infusion (solutions of carbohydrates and/or lipid emulsions).
Angiogram
X-ray or image of the blood vessels and flow of blood within the body.
Angiography
Exploratory radiological technique in which a contrast fluid is injected into the vascular system to render the blood opaque and thus enable observation of the internal state of blood vessels.
Antibody
Protein synthesized by the body in response to the introduction of an antigen.
Anticoagulant
Substance that prevents or reduces blood coagulation.
Antigen
Foreign body that enters the organism and prompts an immune response.
Antiglobulin
Antibody that reacts with the plasma globulins.
Antiseptic
Substance that destroys or inhibits the growth of microorganisms.
Antiserum
Serum or reagent that contains specific antibodies (immunoglobulins) against one or more antigens.
Asepsis
Absence of pathogenic micro-organisms.
Autoclave
Device that uses water vapor at high pressure and high temperature to destroy microorganisms, in order to achieve asepsis. Used to sterilize non-disposable hospital and surgical material, in the manufacture of parenteral solutions, and with other products that need to be sterilized and can withstand this physical process.