“2026 Nursing Pathophysiology Diagnostic
Interpretation Practice Questions Answer
Rationales Laboratory Findings Imaging
Results Disease Processes Clinical
Correlations Review”
SECTION 1: GENERAL LABORATORY INTERPRETATION (1–10)
1. A patient with fatigue and pallor has a serum ferritin of 8 ng/mL. Which
condition is most likely?
A) Iron deficiency anemia
B) Vitamin B12 deficiency
C) Thalassemia trait
D) Anemia of chronic disease
Answer: A) Iron deficiency anemia
Rationale: Ferritin is the most specific marker of iron stores. A low ferritin
confirms iron deficiency. B12 deficiency causes macrocytic anemia with
normal/high ferritin. Thalassemia trait often has normal ferritin. Anemia of chronic
disease usually has normal or high ferritin.
2. A patient has macrocytic anemia, hypersegmented neutrophils, and
elevated methylmalonic acid. Which deficiency is most likely?
A) Iron
B) Folate
C) Vitamin B12
D) Copper
Answer: C) Vitamin B12
Rationale: B12 deficiency causes elevated methylmalonic acid and homocysteine.
,Folate deficiency elevates homocysteine but not methylmalonic acid. Iron
deficiency is microcytic. Copper deficiency can cause anemia but not this classic
pattern.
3. Which laboratory test best reflects average blood glucose over 2–3 months?
A) Fasting glucose
B) Random glucose
C) Hemoglobin A1c
D) Urine glucose
Answer: C) Hemoglobin A1c
Rationale: A1c reflects glycosylation of hemoglobin over the lifespan of red blood
cells, about 2–3 months. Fasting and random glucose reflect immediate levels.
Urine glucose appears only when glucose exceeds renal threshold.
4. Which inflammatory marker rises more rapidly in acute infection?
A) ESR
B) CRP
C) Ferritin
D) Albumin
Answer: B) CRP
Rationale: C-reactive protein rises within 6–8 hours and peaks in 48 hours. ESR
rises more slowly and falls slowly. Ferritin is an acute-phase reactant but less
specific. Albumin is a negative acute-phase reactant.
5. A patient with suspected bacterial pneumonia has an elevated
procalcitonin. What does this suggest?
A) Viral infection
B) Bacterial infection
,C) Autoimmune disease
D) Fungal colonization
Answer: B) Bacterial infection
Rationale: Procalcitonin rises significantly in systemic bacterial infections and
sepsis. It is typically low in viral infections and less elevated in autoimmune
conditions. Fungal colonization does not usually cause marked elevation.
6. Which biomarker is most specific for myocardial injury?
A) CK-MB
B) Troponin I
C) Myoglobin
D) LDH
Answer: B) Troponin I
Rationale: Cardiac troponin I and T are highly specific and sensitive for
myocardial injury. CK-MB is less specific. Myoglobin rises early but is not
cardiac-specific. LDH is nonspecific.
7. A patient with dyspnea and edema has a BNP of 1,200 pg/mL. Which
condition is most likely?
A) Asthma
B) Heart failure
C) Pneumonia
D) COPD
Answer: B) Heart failure
Rationale: BNP is released by ventricular myocytes in response to stretch and
volume overload. Elevated BNP strongly suggests heart failure. Asthma,
pneumonia, and COPD do not typically cause marked BNP elevation.
, 8. A low-risk patient with suspected pulmonary embolism has a negative D-
dimer. What is the best interpretation?
A) PE is confirmed
B) PE is ruled out
C) D-dimer is nonspecific
D) CT angiography is required
Answer: B) PE is ruled out
Rationale: In low or intermediate pretest probability, a negative D-dimer
effectively rules out PE. D-dimer is nonspecific and can be elevated in many
conditions. If D-dimer is positive, imaging is needed.
9. Which laboratory finding best indicates tissue hypoperfusion in sepsis?
A) Elevated lactate
B) Elevated sodium
C) Low BUN
D) High platelets
Answer: A) Elevated lactate
Rationale: Lactate rises due to anaerobic metabolism from tissue hypoperfusion. It
is a key marker of sepsis severity and resuscitation response. Sodium, BUN, and
platelets are not direct perfusion markers.
10. Which test is used to monitor anticoagulation with unfractionated
heparin?
A) PT/INR
B) aPTT
C) Bleeding time
D) Thrombin time
Answer: B) aPTT
Rationale: Unfractionated heparin therapy is monitored with aPTT. Warfarin is
monitored with PT/INR. Bleeding time and thrombin time are not standard for
heparin monitoring.
Interpretation Practice Questions Answer
Rationales Laboratory Findings Imaging
Results Disease Processes Clinical
Correlations Review”
SECTION 1: GENERAL LABORATORY INTERPRETATION (1–10)
1. A patient with fatigue and pallor has a serum ferritin of 8 ng/mL. Which
condition is most likely?
A) Iron deficiency anemia
B) Vitamin B12 deficiency
C) Thalassemia trait
D) Anemia of chronic disease
Answer: A) Iron deficiency anemia
Rationale: Ferritin is the most specific marker of iron stores. A low ferritin
confirms iron deficiency. B12 deficiency causes macrocytic anemia with
normal/high ferritin. Thalassemia trait often has normal ferritin. Anemia of chronic
disease usually has normal or high ferritin.
2. A patient has macrocytic anemia, hypersegmented neutrophils, and
elevated methylmalonic acid. Which deficiency is most likely?
A) Iron
B) Folate
C) Vitamin B12
D) Copper
Answer: C) Vitamin B12
Rationale: B12 deficiency causes elevated methylmalonic acid and homocysteine.
,Folate deficiency elevates homocysteine but not methylmalonic acid. Iron
deficiency is microcytic. Copper deficiency can cause anemia but not this classic
pattern.
3. Which laboratory test best reflects average blood glucose over 2–3 months?
A) Fasting glucose
B) Random glucose
C) Hemoglobin A1c
D) Urine glucose
Answer: C) Hemoglobin A1c
Rationale: A1c reflects glycosylation of hemoglobin over the lifespan of red blood
cells, about 2–3 months. Fasting and random glucose reflect immediate levels.
Urine glucose appears only when glucose exceeds renal threshold.
4. Which inflammatory marker rises more rapidly in acute infection?
A) ESR
B) CRP
C) Ferritin
D) Albumin
Answer: B) CRP
Rationale: C-reactive protein rises within 6–8 hours and peaks in 48 hours. ESR
rises more slowly and falls slowly. Ferritin is an acute-phase reactant but less
specific. Albumin is a negative acute-phase reactant.
5. A patient with suspected bacterial pneumonia has an elevated
procalcitonin. What does this suggest?
A) Viral infection
B) Bacterial infection
,C) Autoimmune disease
D) Fungal colonization
Answer: B) Bacterial infection
Rationale: Procalcitonin rises significantly in systemic bacterial infections and
sepsis. It is typically low in viral infections and less elevated in autoimmune
conditions. Fungal colonization does not usually cause marked elevation.
6. Which biomarker is most specific for myocardial injury?
A) CK-MB
B) Troponin I
C) Myoglobin
D) LDH
Answer: B) Troponin I
Rationale: Cardiac troponin I and T are highly specific and sensitive for
myocardial injury. CK-MB is less specific. Myoglobin rises early but is not
cardiac-specific. LDH is nonspecific.
7. A patient with dyspnea and edema has a BNP of 1,200 pg/mL. Which
condition is most likely?
A) Asthma
B) Heart failure
C) Pneumonia
D) COPD
Answer: B) Heart failure
Rationale: BNP is released by ventricular myocytes in response to stretch and
volume overload. Elevated BNP strongly suggests heart failure. Asthma,
pneumonia, and COPD do not typically cause marked BNP elevation.
, 8. A low-risk patient with suspected pulmonary embolism has a negative D-
dimer. What is the best interpretation?
A) PE is confirmed
B) PE is ruled out
C) D-dimer is nonspecific
D) CT angiography is required
Answer: B) PE is ruled out
Rationale: In low or intermediate pretest probability, a negative D-dimer
effectively rules out PE. D-dimer is nonspecific and can be elevated in many
conditions. If D-dimer is positive, imaging is needed.
9. Which laboratory finding best indicates tissue hypoperfusion in sepsis?
A) Elevated lactate
B) Elevated sodium
C) Low BUN
D) High platelets
Answer: A) Elevated lactate
Rationale: Lactate rises due to anaerobic metabolism from tissue hypoperfusion. It
is a key marker of sepsis severity and resuscitation response. Sodium, BUN, and
platelets are not direct perfusion markers.
10. Which test is used to monitor anticoagulation with unfractionated
heparin?
A) PT/INR
B) aPTT
C) Bleeding time
D) Thrombin time
Answer: B) aPTT
Rationale: Unfractionated heparin therapy is monitored with aPTT. Warfarin is
monitored with PT/INR. Bleeding time and thrombin time are not standard for
heparin monitoring.
