Pretransfusion Testing Flashcards
what AABB standard address pretransfusion?
5: Process Control
serological confirmation required on whole blood, red cells, and granulocyte units
ABO group
Rh of each unit labeled Rh neg
is weak D testing required on labeling of Rh neg units
no
requirements of transfusion request
complete, accurate, legible 2 independent patient identifiers type and amount of component requested special processing requirements ordering physician
pre-transfusion testing regulated by who?
US Federal govt, accrediting agencies
sample requirement of pre-transfusion sample
2 independent patient identifiers
date and time of collection
identification of collector
when must pre-transfusion sample be drawn in relation to transfusion?
within 3 days (if transfused in last 3 months)
how long is pre-transfusion sample kept after transfusion
7 days
how long is segment of donor blood kept after transfusion
7 days
day of collection is day ___ in pre-transfusion testing
0
sample age requirement for patients who have not been pregnant or transfused in the last 90 days
no specific requirement
pre-transfusion specimen requirement for patients less than 4 months old
initial sample for ABO/Rh typing and to detect unexpected maternal red cell antibodies, no additional testing required until 4 months of age if screen is negative
crossmatch requirements for <4 months of age after pre-transfusion testing is complete
crossmatch not necessary if using O red cells if no antibodies present
if antibodies are present, crossmatch not necessary if antigen-negative red cells are used
emergency blood given to women of childbearing age
O negative
emergency blood given to women older than childbearing age and men
O positive
definition: massive transfusion
when a patient receives 10 units of blood in less than 24 hours
when is serologic XM no longer required in massive transfusion?
after 8-10 units
requirement from requesting physician for emergency released uncrossmatched blood
signed statement
requirements of blood product transfusion order from physician
specific component
amount
special requirements
purpose of compatibility testing
prevent hemolytic transfusion reaction
compatibility testing includes:
ABO/Rh of patient
antibody screen of patient
XM between patient plasma and donor red cells
AABB Standards requirement of ABO group for recipient
2 determinations of ABO group
AABB Standards requirement options for second ABO confirmation of recipient
- comparison with previous records
- testing a second sample from a second collection time with NEW VERIFICATION OF PATIENT IDENTIFICATION
- retesting original sample if patient identification was verified using validated electronic identification system
can reagent red cells for antibody detection testing be pooled
no
