Cross Matches Flashcards
Before issue….
a sample of recipients serum/plasma shall be cross matched against a donor sample cells
How are cross matches done?
Using a segment of whole blood
Blood from donor cell
retype ABO before use
Type and screen
Pre transfusion testing
ABO compatibility
blood/type shows?
Use what for Type O?
Only retest?
blood type/reverse shows us what ab can be made
Use A,B ab for unit retyping in O blood
only retest Ag that may immunize
ABO Check
two
Is…
ABO repeat on?
S
H
C
two determinations of recipients ABO group
IS cross match
ABO repeat on:
seperate collected sample
historical record
current sample repeated
Pre transfusion testing
Type and Screen
Crossmatch
Coombs cross match for low incidence Ab
Other clinicially sign ab
if ab screen is pos, do an ab ID
phenotype ab must be NEGATIVE FOR AG
coombs crossmatch between donor/pt
AHG check
Previous hxt of pt
current ab in plasma (known or unknown)
NEW WORKUP EVERY 72 HRS
How long is a workup okay for?
72 hrs
additional unites need crossmatch must be preformed the same way
Neg workups require?
Less work
negative ab screen = ABO match only
computer logic
Exceptions to “before issue”
emergency/neonate/massive transfusion/discrepency
Neonate doesnt need cross match because they dont have abs
Inventory availability
donor population frequency
expiration dates first
balance the need of pts/urgency requests
serological cross match
used when?
mix…
I/e
used when pt has no previous blood type on record
mix rbc from donor segment with plasma of recipient EDTA tube
IS/extended crossmatch
Electronic crossmatch
2
Must be
CANT DO IF
2 determinations of blood type
must be validated at each site and anually after
CAN NOT DO if pt has pos ab screen or hxt or pos Ab
Crossmatch tag
2 pt IDs
unit number/blood types
expiration dates
NEEDS TO BE ATTACHED whole 72hrs
READBACK w RN to verify
