PROFESSIONAL NURSING CERTIFICATION EXAMINATION:
ADOLESCENT IDIOPATHIC THROMBOCYTOPENIC
PURPURA (ITP)
200 Clinical Questions with Comprehensive Rationales
DOMAIN 1: PATHOPHYSIOLOGY & LABORATORY
DIAGNOSTICS (QUESTIONS 1 - 40)
Question 1: A nurse is caring for an adolescent client who has
idiopathic thrombocytopenic purpura (ITP). Which of the following
laboratory values should the nurse expect to be significantly
altered?
A. Elevated white blood cell count with left shift
B. Decreased platelet count (thrombocytopenia)
C. Prolonged activated partial thromboplastin time (aPTT)
D. Elevated red blood cell count and hemoglobin
Correct Answer: B
Rationale: Idiopathic thrombocytopenic purpura (ITP) is an acquired
autoimmune bleeding disorder characterized by autoantibody-mediated
destruction and impaired production of platelets. The hallmark
laboratory finding is isolated thrombocytopenia (platelet count typically
below 100,000/mm³, often < 20,000/mm³), while white blood cells, red
blood cells, and coagulation times (PT, aPTT) remain normal unless
secondary hemorrhage has occurred. White blood cell count (A) is
normal in uncomplicated ITP. Coagulation times (C) measure clotting
factors, which are generally unaffected in ITP since platelet function and
number are the primary issue, not clotting factor deficiencies. Red blood
cell count (D) is normal unless severe acute hemorrhage causes anemia.
,Question 2: An adolescent with newly diagnosed ITP asks the nurse
what causes the low platelet count. Which pathophysiological
mechanism should the nurse explain?
A. Bone marrow failure leading to a total cessation of megakaryocyte
production.
B. Splenic sequestration of platelets due to portal hypertension.
C. Autoantibody binding to platelet membranes, resulting in premature
destruction by splenic macrophages.
D. Consumptive coagulopathy causing widespread microvascular
thrombi.
Correct Answer: C
Rationale: ITP is an autoimmune condition where IgG autoantibodies
(typically against platelet membrane glycoproteins like GPIIb/IIIa or
GPIb/IX) bind to circulating platelets. These antibody-coated platelets
are subsequently recognized and prematurely destroyed by macrophages
in the spleen and reticuloendothelial system. Bone marrow failure (A)
describes aplastic anemia or leukemia. Splenic sequestration (B) occurs
in hypersplenism or portal hypertension. Consumptive coagulopathy (D)
describes Disseminated Intravascular Coagulation (DIC).
Question 3: A nurse is reviewing the laboratory results of an
adolescent client being evaluated for acute ITP. Which additional
baseline laboratory test is most crucial to differentiate ITP from
leukemia or bone marrow failure?
A. Comprehensive metabolic panel (CMP)
B. Bone marrow aspiration and biopsy
C. Erythrocyte sedimentation rate (ESR)
D. Hemoglobin A1c
Correct Answer: B
Rationale: While ITP is a diagnosis of exclusion and a bone marrow
,biopsy is not always required for typical cases in younger children, it is
essential when atypical features are present (e.g., hepatosplenomegaly,
lymphadenopathy, leukopenia, or failure to respond to therapy) to rule
out bone marrow disorders such as leukemia, aplastic anemia, or
myelodysplastic syndrome. CMP (A) assesses organ function. ESR (C)
is a non-specific inflammatory marker. HbA1c (D) evaluates long-term
glycemic control.
Question 4: A school-aged adolescent client with chronic ITP has a
platelet count of 18,000/mm³. Which of the following peripheral
blood smear findings is characteristic of this condition?
A. Presence of schistocytes (helmet cells)
B. Giant platelets (megathrombocytes)
C. Target cells and Howell-Jolly bodies
D. Hypochromic, microcytic red blood cells
Correct Answer: B
Rationale: In immune thrombocytopenia, the bone marrow attempts to
compensate for peripheral platelet destruction by increasing
thrombopoiesis, resulting in the release of young, large platelets known
as giant platelets (megathrombocytes) visible on a peripheral smear.
Schistocytes (A) indicate microangiopathic hemolytic anemias (e.g.,
TTP/HUS). Target cells and Howell-Jolly bodies (C) suggest asplenism
or hemoglobinopathies. Hypochromic microcytic cells (D) indicate iron
deficiency anemia.
Question 5: When assessing coagulation studies in an adolescent
with ITP, the nurse anticipates which of the following results?
A. Prolonged Prothrombin Time (PT) and International Normalized
Ratio (INR)
B. Prolonged Activated Partial Thromboplastin Time (aPTT)
, C. Normal PT, normal aPTT, and normal fibrinogen levels
D. Markedly elevated D-dimer and decreased fibrinogen
Correct Answer: C
Rationale: In pure ITP, the coagulation cascade is intact because clotting
factors (such as fibrinogen, prothrombin, and factor VIII) are produced
normally by the liver. Therefore, PT, aPTT, and fibrinogen levels are
typically within normal limits. Prolonged PT/INR (A) or aPTT (B)
indicate clotting factor deficiencies or anticoagulant therapy. Elevated
D-dimer and decreased fibrinogen (D) indicate DIC.
Question 6: Clinical scenario 6: An adolescent client with ITP
presents for routine monitoring and management. Which nursing
assessment, diagnostic evaluation, or intervention is most
appropriate for this clinical scenario?
A. Administer prophylactic platelet transfusion immediately regardless
of bleeding symptoms.
B. Monitor closely for petechiae, purpura, epistaxis, and signs of
intracranial hemorrhage.
C. Encourage high-impact contact sports to maintain physical fitness
and psychosocial well-being.
D. Restrict all fluid intake to prevent circulatory overload associated
with low platelets.
Correct Answer: B
Rationale for Question 6: Comprehensive nursing care for an adolescent
with ITP centers on vigilant bleeding surveillance, education on activity
modification, monitoring platelet trends, and preparing for emergency
medical interventions if severe bleeding occurs. Prophylactic platelet
transfusions (A) are generally avoided in ITP unless life-threatening
hemorrhage occurs because the autoantibodies will rapidly destroy the
transfused platelets. Contact sports (C) are strictly contraindicated due to
ADOLESCENT IDIOPATHIC THROMBOCYTOPENIC
PURPURA (ITP)
200 Clinical Questions with Comprehensive Rationales
DOMAIN 1: PATHOPHYSIOLOGY & LABORATORY
DIAGNOSTICS (QUESTIONS 1 - 40)
Question 1: A nurse is caring for an adolescent client who has
idiopathic thrombocytopenic purpura (ITP). Which of the following
laboratory values should the nurse expect to be significantly
altered?
A. Elevated white blood cell count with left shift
B. Decreased platelet count (thrombocytopenia)
C. Prolonged activated partial thromboplastin time (aPTT)
D. Elevated red blood cell count and hemoglobin
Correct Answer: B
Rationale: Idiopathic thrombocytopenic purpura (ITP) is an acquired
autoimmune bleeding disorder characterized by autoantibody-mediated
destruction and impaired production of platelets. The hallmark
laboratory finding is isolated thrombocytopenia (platelet count typically
below 100,000/mm³, often < 20,000/mm³), while white blood cells, red
blood cells, and coagulation times (PT, aPTT) remain normal unless
secondary hemorrhage has occurred. White blood cell count (A) is
normal in uncomplicated ITP. Coagulation times (C) measure clotting
factors, which are generally unaffected in ITP since platelet function and
number are the primary issue, not clotting factor deficiencies. Red blood
cell count (D) is normal unless severe acute hemorrhage causes anemia.
,Question 2: An adolescent with newly diagnosed ITP asks the nurse
what causes the low platelet count. Which pathophysiological
mechanism should the nurse explain?
A. Bone marrow failure leading to a total cessation of megakaryocyte
production.
B. Splenic sequestration of platelets due to portal hypertension.
C. Autoantibody binding to platelet membranes, resulting in premature
destruction by splenic macrophages.
D. Consumptive coagulopathy causing widespread microvascular
thrombi.
Correct Answer: C
Rationale: ITP is an autoimmune condition where IgG autoantibodies
(typically against platelet membrane glycoproteins like GPIIb/IIIa or
GPIb/IX) bind to circulating platelets. These antibody-coated platelets
are subsequently recognized and prematurely destroyed by macrophages
in the spleen and reticuloendothelial system. Bone marrow failure (A)
describes aplastic anemia or leukemia. Splenic sequestration (B) occurs
in hypersplenism or portal hypertension. Consumptive coagulopathy (D)
describes Disseminated Intravascular Coagulation (DIC).
Question 3: A nurse is reviewing the laboratory results of an
adolescent client being evaluated for acute ITP. Which additional
baseline laboratory test is most crucial to differentiate ITP from
leukemia or bone marrow failure?
A. Comprehensive metabolic panel (CMP)
B. Bone marrow aspiration and biopsy
C. Erythrocyte sedimentation rate (ESR)
D. Hemoglobin A1c
Correct Answer: B
Rationale: While ITP is a diagnosis of exclusion and a bone marrow
,biopsy is not always required for typical cases in younger children, it is
essential when atypical features are present (e.g., hepatosplenomegaly,
lymphadenopathy, leukopenia, or failure to respond to therapy) to rule
out bone marrow disorders such as leukemia, aplastic anemia, or
myelodysplastic syndrome. CMP (A) assesses organ function. ESR (C)
is a non-specific inflammatory marker. HbA1c (D) evaluates long-term
glycemic control.
Question 4: A school-aged adolescent client with chronic ITP has a
platelet count of 18,000/mm³. Which of the following peripheral
blood smear findings is characteristic of this condition?
A. Presence of schistocytes (helmet cells)
B. Giant platelets (megathrombocytes)
C. Target cells and Howell-Jolly bodies
D. Hypochromic, microcytic red blood cells
Correct Answer: B
Rationale: In immune thrombocytopenia, the bone marrow attempts to
compensate for peripheral platelet destruction by increasing
thrombopoiesis, resulting in the release of young, large platelets known
as giant platelets (megathrombocytes) visible on a peripheral smear.
Schistocytes (A) indicate microangiopathic hemolytic anemias (e.g.,
TTP/HUS). Target cells and Howell-Jolly bodies (C) suggest asplenism
or hemoglobinopathies. Hypochromic microcytic cells (D) indicate iron
deficiency anemia.
Question 5: When assessing coagulation studies in an adolescent
with ITP, the nurse anticipates which of the following results?
A. Prolonged Prothrombin Time (PT) and International Normalized
Ratio (INR)
B. Prolonged Activated Partial Thromboplastin Time (aPTT)
, C. Normal PT, normal aPTT, and normal fibrinogen levels
D. Markedly elevated D-dimer and decreased fibrinogen
Correct Answer: C
Rationale: In pure ITP, the coagulation cascade is intact because clotting
factors (such as fibrinogen, prothrombin, and factor VIII) are produced
normally by the liver. Therefore, PT, aPTT, and fibrinogen levels are
typically within normal limits. Prolonged PT/INR (A) or aPTT (B)
indicate clotting factor deficiencies or anticoagulant therapy. Elevated
D-dimer and decreased fibrinogen (D) indicate DIC.
Question 6: Clinical scenario 6: An adolescent client with ITP
presents for routine monitoring and management. Which nursing
assessment, diagnostic evaluation, or intervention is most
appropriate for this clinical scenario?
A. Administer prophylactic platelet transfusion immediately regardless
of bleeding symptoms.
B. Monitor closely for petechiae, purpura, epistaxis, and signs of
intracranial hemorrhage.
C. Encourage high-impact contact sports to maintain physical fitness
and psychosocial well-being.
D. Restrict all fluid intake to prevent circulatory overload associated
with low platelets.
Correct Answer: B
Rationale for Question 6: Comprehensive nursing care for an adolescent
with ITP centers on vigilant bleeding surveillance, education on activity
modification, monitoring platelet trends, and preparing for emergency
medical interventions if severe bleeding occurs. Prophylactic platelet
transfusions (A) are generally avoided in ITP unless life-threatening
hemorrhage occurs because the autoantibodies will rapidly destroy the
transfused platelets. Contact sports (C) are strictly contraindicated due to
