Antibody Screen: Testing the patient's serum with group O reagent red cells in an
effort to detect atypical antibodies.
Anticoagulant: An agent that prevents or delays blood coagulation.
Antigen (Ag): A substance that is recognized by the body as being foreign, thus it can
elicit an immune response. In blood banking, antigens are usually found on the blood
Antihemophilic Factor (AHF): Term that is sometimes used to describe
cryoprecipitate as well as commercially prepared Factor VIII concentrates.
Antihuman Globulin Test : Test to ascertain the presence or absence of red cell
coating by immunoglobulin (IgG) and/or complement. A positive result is agglutination.
DAT (direct) detects in vivo cell sensitization and IAT (indirect) detects Ag-Ab
reactions that occur in vitro.
Antihuman Globulin (AHG): An antibody prepared in rabbits or other suitable animals
that is directed against human immunoglobulin and/or complement. It is used to
perform the antihuman globulin or Coombs' test. The serum may be either polyspecific
(anti-IgG and anti-complement) or monospecific (either anti-IgG or anti-complement).
AO: Area of Operations.
Apheresis: A method of blood collection in which whole blood is withdrawn, a desired
component separated and retained, and the remainder of the blood returned to the
AS-1: Anticoagulant Adsol (CPD plus additive solution) of Fenwal that has a shelf life of
42 days. Several BDCs within DOD were licensed for AS-1 in 1996.
AS-5: Anticoagulant Adsol (CPD plus additive solution) of Terumo that has a shelf life
of 42 days. Several BDCs within DOD were licensed for AS-5 in 1996.
ASBP: Armed Services Blood Program directed by the ASBPO.
ASBPO: Armed Services Blood Program Office. A tri-Service staffed DOD field
operating agency responsible for ensuring implementation and coordination of
ASD(HA)-established blood program policies and management of blood resources.
ASD(HA): Assistant Secretary of Defense (Health Affairs).
Asymptomatic: Without symptoms.