BCOTP Solid Organ Transplant Pharmacy Certification Exam 2026:
Advanced Professional Practice Test — Immunosuppressive
Therapy, Transplant Pharmacotherapy, Rejection Management,
Infection Prevention & Medication Safety — 190 Multiple-Choice
Questions with Answers & Detailed Rationales
Section 1: Transplant Immunology and Histocompatibility (Questions 1–38)
Question 1
Which class of human leukocyte antigens includes the A, B, and C loci and is expressed on
virtually all nucleated cells?
A. Class I
B. Class II
C. Class III
D. Class IV
Correct Answer: A
Explanation: HLA Class I antigens (A, B, C) present endogenous peptides to CD8+ cytotoxic T
cells and are expressed on all nucleated cells. HLA Class II (DR, DQ, DP) presents exogenous
peptides to CD4+ helper T cells.
Question 2
Which HLA class II locus is considered the most important for kidney transplant matching
and is included in the standard six-antigen match?
A. HLA-DP
,B. HLA-DQ
C. HLA-DR
D. HLA-DM
Correct Answer: C
Explanation: HLA-DR is the most critical class II locus for kidney transplant matching. The
standard six-antigen match considers two alleles each at HLA-A, HLA-B, and HLA-DR.
Question 3
A patient receives a kidney transplant from a donor with whom they share no HLA matches.
Which type of transplant is this classified as?
A. Isograft
B. Allograft
C. Autograft
D. Xenograft
Correct Answer: B
Explanation: An allograft is transplantation between genetically different individuals of the
same species. This is the most common transplant type and requires immunosuppression to
prevent rejection.
Question 4
What is the primary mechanism by which preformed donor-specific antibodies cause
hyperacute rejection?
,A. Direct T-cell cytotoxicity
B. Complement activation and endothelial damage
C. Macrophage phagocytosis of graft cells
D. Natural killer cell degranulation
Correct Answer: B
Explanation: Preformed antibodies bind to donor endothelial antigens, activate complement,
and cause rapid thrombosis and ischemic necrosis. This occurs within minutes to hours of
reperfusion and is now rare due to crossmatch testing.
Question 5
Which laboratory test detects the presence of preformed antibodies against donor
lymphocytes before transplantation?
A. Enzyme-linked immunosorbent assay
B. Complement-dependent cytotoxicity crossmatch
C. Flow cytometry panel reactive antibody
D. Mixed lymphocyte reaction
Correct Answer: B
Explanation: The complement-dependent cytotoxicity crossmatch tests recipient serum
against donor lymphocytes. A positive T-cell crossmatch is a contraindication to
transplantation due to high risk of hyperacute rejection.
Question 6
, What is the primary role of the thymus in transplantation immunology?
A. Production of mature B lymphocytes
B. Negative selection of self-reactive T cells
C. Storage of memory T cells
D. Synthesis of complement proteins
Correct Answer: B
Explanation: The thymus performs negative selection, eliminating T cells that strongly
recognize self-antigens. This prevents autoimmunity and establishes central tolerance
essential for immune self-recognition.
Question 7
Which cell type is the primary antigen-presenting cell that initiates acute cellular rejection?
A. B lymphocyte
B. Dendritic cell
C. Natural killer cell
D. Neutrophil
Correct Answer: B
Explanation: Donor and recipient dendritic cells are professional antigen-presenting cells
that process and present alloantigens to T cells, initiating the rejection cascade through
direct and indirect recognition pathways.
Advanced Professional Practice Test — Immunosuppressive
Therapy, Transplant Pharmacotherapy, Rejection Management,
Infection Prevention & Medication Safety — 190 Multiple-Choice
Questions with Answers & Detailed Rationales
Section 1: Transplant Immunology and Histocompatibility (Questions 1–38)
Question 1
Which class of human leukocyte antigens includes the A, B, and C loci and is expressed on
virtually all nucleated cells?
A. Class I
B. Class II
C. Class III
D. Class IV
Correct Answer: A
Explanation: HLA Class I antigens (A, B, C) present endogenous peptides to CD8+ cytotoxic T
cells and are expressed on all nucleated cells. HLA Class II (DR, DQ, DP) presents exogenous
peptides to CD4+ helper T cells.
Question 2
Which HLA class II locus is considered the most important for kidney transplant matching
and is included in the standard six-antigen match?
A. HLA-DP
,B. HLA-DQ
C. HLA-DR
D. HLA-DM
Correct Answer: C
Explanation: HLA-DR is the most critical class II locus for kidney transplant matching. The
standard six-antigen match considers two alleles each at HLA-A, HLA-B, and HLA-DR.
Question 3
A patient receives a kidney transplant from a donor with whom they share no HLA matches.
Which type of transplant is this classified as?
A. Isograft
B. Allograft
C. Autograft
D. Xenograft
Correct Answer: B
Explanation: An allograft is transplantation between genetically different individuals of the
same species. This is the most common transplant type and requires immunosuppression to
prevent rejection.
Question 4
What is the primary mechanism by which preformed donor-specific antibodies cause
hyperacute rejection?
,A. Direct T-cell cytotoxicity
B. Complement activation and endothelial damage
C. Macrophage phagocytosis of graft cells
D. Natural killer cell degranulation
Correct Answer: B
Explanation: Preformed antibodies bind to donor endothelial antigens, activate complement,
and cause rapid thrombosis and ischemic necrosis. This occurs within minutes to hours of
reperfusion and is now rare due to crossmatch testing.
Question 5
Which laboratory test detects the presence of preformed antibodies against donor
lymphocytes before transplantation?
A. Enzyme-linked immunosorbent assay
B. Complement-dependent cytotoxicity crossmatch
C. Flow cytometry panel reactive antibody
D. Mixed lymphocyte reaction
Correct Answer: B
Explanation: The complement-dependent cytotoxicity crossmatch tests recipient serum
against donor lymphocytes. A positive T-cell crossmatch is a contraindication to
transplantation due to high risk of hyperacute rejection.
Question 6
, What is the primary role of the thymus in transplantation immunology?
A. Production of mature B lymphocytes
B. Negative selection of self-reactive T cells
C. Storage of memory T cells
D. Synthesis of complement proteins
Correct Answer: B
Explanation: The thymus performs negative selection, eliminating T cells that strongly
recognize self-antigens. This prevents autoimmunity and establishes central tolerance
essential for immune self-recognition.
Question 7
Which cell type is the primary antigen-presenting cell that initiates acute cellular rejection?
A. B lymphocyte
B. Dendritic cell
C. Natural killer cell
D. Neutrophil
Correct Answer: B
Explanation: Donor and recipient dendritic cells are professional antigen-presenting cells
that process and present alloantigens to T cells, initiating the rejection cascade through
direct and indirect recognition pathways.
