Case 2: A 52-year-old female high school band teacher nearly fainted one afternoon while demonstrating some trombone-pla

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Case 2: A 52-year-old female high school band teacher nearlyfainted one afternoon while demonstrating some trombone-playingtechniques to one of her students. She went to her physiciancomplaining of shortness of breath, mild depression, irritability,and a loss of appetite (which was uncharacteristic). Her physiciannoted signs of anemia and had some hematology tests done. Mostnotable was her hemoglobin of 5.2 g/dL, hematocrit of 14.8%, andreticulocyte count of 10.5%. He sent blood samples to the hospitalblood bank for type and crossmatch for 4 units of red blood cellsfor outpatient transfusion ASAP. The patient was not thrilled atthe prospect of a transfusion since she’d had a bad experience onetime previously when transfused for multiple fractures incurred ina motorcycle accident in her wilder days.
The blood bank tested her samples and got the followingresults:
Blood Type
Anti-A
Anti-B
Anti-D
A1 cell
B cell
0
0
3+
4+
4+
Screen
IS
37
AHG
CC
SC1
0
0
2+
NT
SC2
0
0
3+
NT
SC3
0
0
4+
NT
A panel and DAT were performed as follow up testing. Theresults are as follows:
Panel: All panel cells positive.
DAT
AHG
Anti-IgG
Anti-C3d
Control
3+
3+
1+
0
What has caused these results?
Group of answer choices
Allo anti-K
Allo anti-M
Warm Auto Antibody
Rouleaux