For pretranfusion testing, the recipient's serum should be less than ______ days
old to help ensure the presence of complement.
Units of blood held for several days must be recrossmatched with a new serum
specimen if the last transfusion given was over _____ hours.
The donor and recipient should have the same ABO group and Rh type EXCEPT
when there is:
a. Unavailability of such blood.
b. ABO or Rh hemolytic disease.
All the above.
After transfusion of nongroup-specific blood, changing to group-specific blood is
permitted only if crossmatches with a freshly drawn patient sample indicate: