Five days after transfusion, a patient becomes mildly jaundiced and experiences a drop in hemoglobin and hematocrit with no apparent hemorrhage. Below are the results of the transfusion reaction workup. In order to reach a conclusion, the technologist should first Anti-A Anti-B Anti-D A1 Cells B Cells Ab Screen DAT Patient Pretransfusion 0 4+ 3+ 4+ 0 0 0 Patient Posttransfusion 0 4+ 3+ 4+ 0 1+ 1+ Donor #1 0 0 3+ Donor #2 0 4+ 3+

An Rh negative donor who tests positive at AHG with anti-D would be labeled as:

The LW antigen is associated with the Rh system in what way?

Blood selected for an exchange transfusion must:

The phenomenon of an Rh-positive person whose serum contains anti-D is best explained by:

The medical laboratory scientist has recently been promoted to a supervisory position in the transfusion service of a small rural hospital. He feels that the optimal blood in inventory should be reviewed. The data for the previous 3 months of group A, Rh-positive blood usage are given below. Week Usage   Week Usage 1 2   7 11 2 2   8 3 3 1   9 2 4 3   10 1 5 1   11 2 6 3   12 2 Assuming that these data are representative of a 6-month period, what should the optimal inventory of A-positive units be for this institution if calculated by average weekly use?

Below are the Rh phenotypes of 4 donor units. If a patient has anti-e in the serum, which of the units of red cells may he or she receive without expecting a reaction due to this antibody?

A group A recipient requires a transfusion of 2 units of frozen plasma. Which of the following types are appropriate to select for transfusion?

Even in the absence of prior transfusion or pregnancy, individuals with the Bombay phenotype will always have naturally occurring:

A 10-year old girl was hospitalized because her urine had a distinct red color. The patient has recently recovered from an upper respiratory infection and appeared very pale and lethargic. Tests were performed with the following results: Hemoglobin: 5g/dL Direct Antiglobulin Test: Positive (for complement only) Antibody screen: Negative Donath-Landsteiner test: Positive The patient probably has: