#serum

• Agglutinin — A specific antibody or protein substance present in blood plasma or immune serum, capable of inducing the process of agglutination (clumping together) of foreign cells, bacteria, erythrocytes, or antigen-bearing particles. It plays a fundamental role in blood typing and in the immune defense mechanisms of the organism.
• Albumin — A macromolecular protein soluble in water and dilute salt solutions, coagulable by heat, present in large quantities in blood plasma, lymph, egg white, and some plant seeds, playing an essential role in maintaining osmotic pressure and transporting nutrients.
• Aldolasemia — The presence of the enzyme called aldolase in the circulating blood; in a clinical sense, the term refers to the numerical value or concentration of this enzyme in the patient's plasma. Fluctuations in this value indicate the integrity level of cellular membranes in striated muscle and hepatic tissues.
• Alexin — A historical term used in early immunology, introduced by Hans Buchner and popularized by Jules Bordet, to designate the complement system; a thermolabile protein substance present in normal blood serum capable of destroying bacteria and other foreign cells in cooperation with specific antibodies (sensitizers). In modern biochemistry, its action is studied as an integral part of the innate non-specific immune response of cell lysis.
• Allotypic — Pertaining to or relating to an allotype, or presenting a structural variation specific to a subset of individuals within the same species. In immunogenetics, it describes antigenic determinants or polymorphic sequence modifications of serum proteins; in psychology, it can refer to behaviors or traits externally adapted or determined by complementary factors.
• Amylasemia — The presence and concentration of the amylase enzyme in the circulating blood; a clinical laboratory medical test that measures the activity of serum amylase. The evaluation of this biological constant is an essential emergency investigation in diagnosing acute abdominal syndromes, as its sudden increase (hyperamylasemia) signals damage to the pancreatic tissue or salivary glands.
• Antibotulinic — Neutralizing, combating, or destroying the botulinum toxin produced by the Clostridium botulinum bacterium; a medication, immunological serum, or specific antibody used in the emergency treatment of botulism. In a clinical sense, the antibotulinum serum blocks the neurotoxin from binding to peripheral nervous system receptors, preventing progressive muscle paralysis and saving the patient's life.
• Anti-anthrax — Combating, preventing, or neutralizing the anthrax infection caused by the Bacillus anthracis bacterium; a medication, protective immunological serum, or vaccine administered urgently to humans or domestic animals exposed to contamination or wounds structurally infected with anthrax spores.
• Anticomplementary — Destroying, inactivating, reducing, or interfering with the biological activity of the complement (a group of proteins in blood serum participating in immune response and bacterial destruction). In laboratory diagnosis and serology, the anticomplementary property of a degraded or contaminated blood sample can falsify biological test results, specifically within the complement fixation reaction.
• Antiglobulin — A specific antibody (immunoglobulin) obtained by immunizing an animal, capable of recognizing and binding to other human globulins (antibodies) present in serum or fixed on cell surfaces; utilized as an essential immunological reagent in laboratory diagnostics (such as the Coombs test).
• Antiserum — Blood serum (obtained from previously immunized humans or animals) containing a high concentration of specific antibodies directed against a particular antigen, virus, bacterium, bacterial toxin, or venom. In medical and emergency practice, antiserum is administered to provide immediate passive immunity, rapidly neutralizing dangerous pathogens or toxins released into the body before the patient's immune system can react.
• Anti-tetanus — Acting directly against the disease known as tetanus; synonymous with antitetanic, but more frequently used as an invariable adjective directly attached to nouns like 'vaccine' or 'serum' in current medical speech and on pharmaceutical labels to indicate their specific therapeutic destination.
• Antitoxic — Neutralizing, blocking, or combating the harmful action of toxins, poisons, or noxious chemical substances that have entered the body. It typically applies to biological immunoglobulin sera (antitoxins), hepatic detoxification treatments, or protective equipment specially designed to nullify the lethal effect of complex chemical compounds.
• Antitoxin — A specific antibody formed in the body of a human or animal as an immune response to the introduction of a bacterial, plant, or animal toxin, having the capacity to selectively neutralize its toxic effect. In medical practice, the term also designates the injectable pharmaceutical preparation obtained from the serum of immunized animals, used as an emergency treatment in serious infectious diseases such as diphtheria, tetanus, or botulism.
• Antivenomous — Combating, nullifying, or neutralizing the effects of venom; destructive in relation to biological toxins injected by reptiles, insects, or arachnids. It is used almost exclusively in the phrase 'antivenom serum', designating an injectable therapeutic solution containing antibodies ready and capable of blocking the spread of poison within the circulatory system.
• Autoagglutinin — A specific autoantibody present in an individual's serum, capable of recognizing and binding to antigens located on the membrane of their own blood cells (especially erythrocytes), causing their premature agglutination or destruction; a key immunological component in the pathogenesis of autoimmune eras.
• Autoantibody — An antibody produced by an individual's immune system that, due to a functional recognition error, is pathologically directed against the host organism's own cells, tissues, or molecular constituents; a central factor in the triggering, progression, and clinical diagnosis of autoimmune diseases.
• Autoserotherapy — A medical therapeutic method consisting of injecting a patient with their own blood serum, previously obtained by centrifuging blood drawn from the same individual. This biological procedure is sometimes used in dermatology or allergology as a non-specific adjuvant treatment, aimed at stimulating the immune system's natural reactivity and desensitizing the body in cases of chronic conditions such as urticaria or stubborn dermatoses.