2026-2027 COMPREHENSIVE EDITION (RATIONALES)
NSG 550 Exam 2 Diagnostic Review Questions
& Answers 2026-2027 — Comprehensive
Edition (Rationales)
Comprehensive 100-Question Diagnostic Practice Examination
NSG 550 Exam 2 Diagnostic Review Questions & Answers 2026-2027 —
Exam Title:
Comprehensive Edition (Rationales)
Target Audience: Advanced Practice Registered Nurse (APRN) / MSN Students
Question Format: Integrated Question, Options, Correct Answer & Rationale
Total Questions: 100 Diagnostic Review Questions with Complete Rationales
Passing Score Threshold: 100% Guaranteed Pass Standards ( Correct)
Designation: 2026-2027 Academic Edition
Document Overview: This comprehensive edition provides 100 diagnostic review questions with pre-filled correct answers and
detailed rationales. It covers key concepts in advanced nursing diagnostics and clinical reasoning. This resource is ideal for
in-depth study, comprehensive exam review, and certification preparation.
,NSG 550 EXAM 2 DIAGNOSTIC REVIEW — 2026-2027 COMPREHENSIVE EDITION (RATIONALES)
Questions & Diagnostic Review (1 - 100)
QUESTION 1 OF 100 — [Genetic Respiratory Disorders]
A 34-year-old non-smoker presents with progressive exertional dyspnea, wheezing, and a chronic dry
cough. High-resolution chest CT demonstrates bilateral lower-lobe panacinar emphysema. Serum
transaminases are mildly elevated. Which diagnostic evaluation is most appropriate to establish the
underlying etiology?
(A) Serum angiotensin-converting enzyme (ACE) assay
(B) Quantitative serum immunoglobulin G (IgG) subclass panel
(C) Sweat chloride iontophoresis testing
(D) Serum alpha-1 antitrypsin (AAT) level and Pi-genotyping [CORRECT ANSWER]
Correct Answer: Option D — Serum alpha-1 antitrypsin (AAT) level and Pi-genotyping
Rationale: Alpha-1 antitrypsin (AAT) deficiency is an autosomal codominant disorder leading to uninhibited neutrophil elastase
activity and panacinar emphysema predominantly affecting the lung bases. Serum quantitative AAT levels combined with
Pi-genotyping (e.g., PiZZ phenotype) provide definitive diagnosis. Option A is incorrect because serum ACE levels monitor
granulomatous inflammation in sarcoidosis, not AAT deficiency. Option B is incorrect because immunoglobulin panels evaluate
humoral immunodeficiencies, which present with recurrent sinopulmonary infections. Option C is incorrect because sweat chloride
iontophoresis tests for cystic fibrosis, which presents with upper-lobe bronchiectasis.
QUESTION 2 OF 100 — [Granulomatous Lung Disease]
A 42-year-old female with known pulmonary sarcoidosis returns for routine follow-up. She reports
increased exertional dyspnea and persistent nonproductive cough. Which serum laboratory biomarker
is most commonly utilized to evaluate active granulomatous inflammation in this patient?
(A) C1 esterase inhibitor functional activity
(B) Eosinophil cationic protein concentration
(C) Serum angiotensin-converting enzyme (ACE) level [CORRECT ANSWER]
(D) Serum brain natriuretic peptide (BNP) level
Correct Answer: Option C — Serum angiotensin-converting enzyme (ACE) level
Rationale: Serum angiotensin-converting enzyme (ACE) is secreted by epithelioid cells within non-caseating granulomas. Elevated
serum ACE levels correlate with active sarcoidosis disease burden and are useful for monitoring clinical progression and
therapeutic response. Option A is incorrect because c1 esterase inhibitor activity evaluates hereditary angioedema. Option B is
incorrect because eosinophil cationic protein is a marker of allergic airway inflammation in asthma. Option D is incorrect because
serum BNP evaluates ventricular wall stretch in heart failure.
NSG 550 ADVANCED HEALTH ASSESSMENT & DIAGNOSTIC REASONING Page 2 of 36
,NSG 550 EXAM 2 DIAGNOSTIC REVIEW — 2026-2027 COMPREHENSIVE EDITION (RATIONALES)
QUESTION 3 OF 100 — [Arterial Blood Gas Analysis]
An arterial blood gas (ABG) sample drawn from a patient with an acute exacerbation of severe chronic
obstructive pulmonary disease yields: pH 7.28, PaCO2 62 mmHg, PaO2 54 mmHg, and HCO3- 29 mEq/L.
How should the advanced practice nurse interpret this acid-base status?
(A) Uncompensated metabolic acidosis
(B) Respiratory acidosis with partial metabolic compensation [CORRECT ANSWER]
(C) Fully compensated respiratory acidosis
(D) Combined respiratory and metabolic alkalosis
Correct Answer: Option B — Respiratory acidosis with partial metabolic compensation
Rationale: The pH of 7.28 indicates acidemia (pH < 7.35). The PaCO2 of 62 mmHg is elevated (normal 35-45 mmHg), defining a
primary respiratory acidosis. The HCO3- of 29 mEq/L is elevated above normal (22-26 mEq/L), indicating renal retention of
bicarbonate to compensate. Because the pH remains abnormal (< 7.35), compensation is partial. Option A is incorrect because
uncompensated metabolic acidosis would present with low pH and low HCO3- with normal PaCO2. Option C is incorrect because
fully compensated respiratory acidosis requires a normal pH (7.35–7.45) despite abnormal PaCO2 and HCO3-. Option D is
incorrect because combined alkalosis would feature a pH > 7.45 with decreased PaCO2 or elevated HCO3-.
QUESTION 4 OF 100 — [Toxicological Respiratory Emergencies]
A firefighter is brought to the emergency department following exposure to dense smoke in a structural
fire. The patient reports headache, nausea, and confusion. Standard pulse oximetry displays an oxygen
saturation (SpO2) of 99% on room air. Which diagnostic test must be immediately performed to
establish the diagnosis?
(A) Venous blood lactate concentration
(B) Peak expiratory flow rate measurement
(C) High-resolution computed tomography of the chest
(D) Arterial blood co-oximetry measuring carboxyhemoglobin (COHb) level [CORRECT ANSWER]
Correct Answer: Option D — Arterial blood co-oximetry measuring carboxyhemoglobin (COHb) level
Rationale: Standard dual-wavelength pulse oximeters cannot distinguish between oxyhemoglobin and carboxyhemoglobin
(COHb), resulting in falsely elevated SpO2 readings. Direct arterial blood gas analysis with co-oximetry measures exact COHb
percentage, which is essential for diagnosing carbon monoxide toxicity. Option A is incorrect because lactate assesses tissue
hypoperfusion/cyanide toxicity, but does not quantify COHb level. Option B is incorrect because peak expiratory flow measures
airway resistance in obstructive disorders, not carbon monoxide displacement of oxygen. Option C is incorrect because chest CT
evaluates parenchymal lung injury or inhalation edema, not toxic carboxyhemoglobin levels.
NSG 550 ADVANCED HEALTH ASSESSMENT & DIAGNOSTIC REASONING Page 3 of 36
, NSG 550 EXAM 2 DIAGNOSTIC REVIEW — 2026-2027 COMPREHENSIVE EDITION (RATIONALES)
QUESTION 5 OF 100 — [Thromboembolic Diagnostics]
A 28-year-old female presents with mild atypical chest pain. Her Wells score for pulmonary embolism
(PE) is 1.0, indicating low pre-test probability. A high-sensitivity quantitative D-dimer assay returns
negative (< 500 ng/mL FEU). What is the clinical significance of this result?
(A) It confirms the presence of microvascular pulmonary thrombosis
(B) It has a high negative predictive value and safely rules out PE without imaging [CORRECT ANSWER]
(C) It indicates a high risk for deep vein thrombosis requiring immediate anticoagulation
(D) It is non-diagnostic and mandates an immediate pulmonary angiogram
Correct Answer: Option B — It has a high negative predictive value and safely rules out PE without imaging
Rationale: In patients with low or intermediate pre-test clinical probability (low Wells score), a negative high-sensitivity D-dimer
assay possesses a negative predictive value exceeding 99%, effectively ruling out pulmonary embolism and obviating the need for
diagnostic chest imaging. Option A is incorrect because a negative D-dimer rules out active fibrinolysis and major thrombosis rather
than confirming microthrombosis. Option C is incorrect because a negative D-dimer rules out acute venous thromboembolism
rather than indicating high risk. Option D is incorrect because mandating pulmonary angiography for a negative D-dimer in a
low-risk patient leads to unnecessary invasive risks.
QUESTION 6 OF 100 — [Pulmonary Imaging & V/Q Scanning]
A 62-year-old male with severe chronic kidney disease (eGFR 18 mL/min/1.73m2) presents with
sudden-onset dyspnea, pleuritic chest pain, and tachypnea. Pulmonary embolism is suspected.
Baseline chest radiograph is completely normal. Which imaging study is most appropriate?
(A) Contrast-enhanced computed tomography pulmonary angiography (CTPA)
(B) Fluoroscopic barium swallow examination
(C) Radionuclide ventilation-perfusion (V/Q) scan [CORRECT ANSWER]
(D) Transthoracic echocardiogram with bubble study
Correct Answer: Option C — Radionuclide ventilation-perfusion (V/Q) scan
Rationale: CTPA requires iodinated intravenous contrast, which poses a severe risk of contrast-induced acute kidney injury in
patients with eGFR < 30 mL/min. When baseline chest radiographs are normal, a radionuclide V/Q scan is the preferred
non-nephrotoxic alternative for diagnosing pulmonary embolism. Option A is incorrect because cTPA poses significant risk of
nephrotoxicity in advanced chronic kidney disease (eGFR 18). Option B is incorrect because barium swallow evaluates esophageal
motility and structure, not pulmonary vascular occlusion. Option D is incorrect because echocardiogram evaluates intracardiac
shunts and right strain, but cannot definitively diagnose PE compared to V/Q scan.
NSG 550 ADVANCED HEALTH ASSESSMENT & DIAGNOSTIC REASONING Page 4 of 36
NSG 550 Exam 2 Diagnostic Review Questions
& Answers 2026-2027 — Comprehensive
Edition (Rationales)
Comprehensive 100-Question Diagnostic Practice Examination
NSG 550 Exam 2 Diagnostic Review Questions & Answers 2026-2027 —
Exam Title:
Comprehensive Edition (Rationales)
Target Audience: Advanced Practice Registered Nurse (APRN) / MSN Students
Question Format: Integrated Question, Options, Correct Answer & Rationale
Total Questions: 100 Diagnostic Review Questions with Complete Rationales
Passing Score Threshold: 100% Guaranteed Pass Standards ( Correct)
Designation: 2026-2027 Academic Edition
Document Overview: This comprehensive edition provides 100 diagnostic review questions with pre-filled correct answers and
detailed rationales. It covers key concepts in advanced nursing diagnostics and clinical reasoning. This resource is ideal for
in-depth study, comprehensive exam review, and certification preparation.
,NSG 550 EXAM 2 DIAGNOSTIC REVIEW — 2026-2027 COMPREHENSIVE EDITION (RATIONALES)
Questions & Diagnostic Review (1 - 100)
QUESTION 1 OF 100 — [Genetic Respiratory Disorders]
A 34-year-old non-smoker presents with progressive exertional dyspnea, wheezing, and a chronic dry
cough. High-resolution chest CT demonstrates bilateral lower-lobe panacinar emphysema. Serum
transaminases are mildly elevated. Which diagnostic evaluation is most appropriate to establish the
underlying etiology?
(A) Serum angiotensin-converting enzyme (ACE) assay
(B) Quantitative serum immunoglobulin G (IgG) subclass panel
(C) Sweat chloride iontophoresis testing
(D) Serum alpha-1 antitrypsin (AAT) level and Pi-genotyping [CORRECT ANSWER]
Correct Answer: Option D — Serum alpha-1 antitrypsin (AAT) level and Pi-genotyping
Rationale: Alpha-1 antitrypsin (AAT) deficiency is an autosomal codominant disorder leading to uninhibited neutrophil elastase
activity and panacinar emphysema predominantly affecting the lung bases. Serum quantitative AAT levels combined with
Pi-genotyping (e.g., PiZZ phenotype) provide definitive diagnosis. Option A is incorrect because serum ACE levels monitor
granulomatous inflammation in sarcoidosis, not AAT deficiency. Option B is incorrect because immunoglobulin panels evaluate
humoral immunodeficiencies, which present with recurrent sinopulmonary infections. Option C is incorrect because sweat chloride
iontophoresis tests for cystic fibrosis, which presents with upper-lobe bronchiectasis.
QUESTION 2 OF 100 — [Granulomatous Lung Disease]
A 42-year-old female with known pulmonary sarcoidosis returns for routine follow-up. She reports
increased exertional dyspnea and persistent nonproductive cough. Which serum laboratory biomarker
is most commonly utilized to evaluate active granulomatous inflammation in this patient?
(A) C1 esterase inhibitor functional activity
(B) Eosinophil cationic protein concentration
(C) Serum angiotensin-converting enzyme (ACE) level [CORRECT ANSWER]
(D) Serum brain natriuretic peptide (BNP) level
Correct Answer: Option C — Serum angiotensin-converting enzyme (ACE) level
Rationale: Serum angiotensin-converting enzyme (ACE) is secreted by epithelioid cells within non-caseating granulomas. Elevated
serum ACE levels correlate with active sarcoidosis disease burden and are useful for monitoring clinical progression and
therapeutic response. Option A is incorrect because c1 esterase inhibitor activity evaluates hereditary angioedema. Option B is
incorrect because eosinophil cationic protein is a marker of allergic airway inflammation in asthma. Option D is incorrect because
serum BNP evaluates ventricular wall stretch in heart failure.
NSG 550 ADVANCED HEALTH ASSESSMENT & DIAGNOSTIC REASONING Page 2 of 36
,NSG 550 EXAM 2 DIAGNOSTIC REVIEW — 2026-2027 COMPREHENSIVE EDITION (RATIONALES)
QUESTION 3 OF 100 — [Arterial Blood Gas Analysis]
An arterial blood gas (ABG) sample drawn from a patient with an acute exacerbation of severe chronic
obstructive pulmonary disease yields: pH 7.28, PaCO2 62 mmHg, PaO2 54 mmHg, and HCO3- 29 mEq/L.
How should the advanced practice nurse interpret this acid-base status?
(A) Uncompensated metabolic acidosis
(B) Respiratory acidosis with partial metabolic compensation [CORRECT ANSWER]
(C) Fully compensated respiratory acidosis
(D) Combined respiratory and metabolic alkalosis
Correct Answer: Option B — Respiratory acidosis with partial metabolic compensation
Rationale: The pH of 7.28 indicates acidemia (pH < 7.35). The PaCO2 of 62 mmHg is elevated (normal 35-45 mmHg), defining a
primary respiratory acidosis. The HCO3- of 29 mEq/L is elevated above normal (22-26 mEq/L), indicating renal retention of
bicarbonate to compensate. Because the pH remains abnormal (< 7.35), compensation is partial. Option A is incorrect because
uncompensated metabolic acidosis would present with low pH and low HCO3- with normal PaCO2. Option C is incorrect because
fully compensated respiratory acidosis requires a normal pH (7.35–7.45) despite abnormal PaCO2 and HCO3-. Option D is
incorrect because combined alkalosis would feature a pH > 7.45 with decreased PaCO2 or elevated HCO3-.
QUESTION 4 OF 100 — [Toxicological Respiratory Emergencies]
A firefighter is brought to the emergency department following exposure to dense smoke in a structural
fire. The patient reports headache, nausea, and confusion. Standard pulse oximetry displays an oxygen
saturation (SpO2) of 99% on room air. Which diagnostic test must be immediately performed to
establish the diagnosis?
(A) Venous blood lactate concentration
(B) Peak expiratory flow rate measurement
(C) High-resolution computed tomography of the chest
(D) Arterial blood co-oximetry measuring carboxyhemoglobin (COHb) level [CORRECT ANSWER]
Correct Answer: Option D — Arterial blood co-oximetry measuring carboxyhemoglobin (COHb) level
Rationale: Standard dual-wavelength pulse oximeters cannot distinguish between oxyhemoglobin and carboxyhemoglobin
(COHb), resulting in falsely elevated SpO2 readings. Direct arterial blood gas analysis with co-oximetry measures exact COHb
percentage, which is essential for diagnosing carbon monoxide toxicity. Option A is incorrect because lactate assesses tissue
hypoperfusion/cyanide toxicity, but does not quantify COHb level. Option B is incorrect because peak expiratory flow measures
airway resistance in obstructive disorders, not carbon monoxide displacement of oxygen. Option C is incorrect because chest CT
evaluates parenchymal lung injury or inhalation edema, not toxic carboxyhemoglobin levels.
NSG 550 ADVANCED HEALTH ASSESSMENT & DIAGNOSTIC REASONING Page 3 of 36
, NSG 550 EXAM 2 DIAGNOSTIC REVIEW — 2026-2027 COMPREHENSIVE EDITION (RATIONALES)
QUESTION 5 OF 100 — [Thromboembolic Diagnostics]
A 28-year-old female presents with mild atypical chest pain. Her Wells score for pulmonary embolism
(PE) is 1.0, indicating low pre-test probability. A high-sensitivity quantitative D-dimer assay returns
negative (< 500 ng/mL FEU). What is the clinical significance of this result?
(A) It confirms the presence of microvascular pulmonary thrombosis
(B) It has a high negative predictive value and safely rules out PE without imaging [CORRECT ANSWER]
(C) It indicates a high risk for deep vein thrombosis requiring immediate anticoagulation
(D) It is non-diagnostic and mandates an immediate pulmonary angiogram
Correct Answer: Option B — It has a high negative predictive value and safely rules out PE without imaging
Rationale: In patients with low or intermediate pre-test clinical probability (low Wells score), a negative high-sensitivity D-dimer
assay possesses a negative predictive value exceeding 99%, effectively ruling out pulmonary embolism and obviating the need for
diagnostic chest imaging. Option A is incorrect because a negative D-dimer rules out active fibrinolysis and major thrombosis rather
than confirming microthrombosis. Option C is incorrect because a negative D-dimer rules out acute venous thromboembolism
rather than indicating high risk. Option D is incorrect because mandating pulmonary angiography for a negative D-dimer in a
low-risk patient leads to unnecessary invasive risks.
QUESTION 6 OF 100 — [Pulmonary Imaging & V/Q Scanning]
A 62-year-old male with severe chronic kidney disease (eGFR 18 mL/min/1.73m2) presents with
sudden-onset dyspnea, pleuritic chest pain, and tachypnea. Pulmonary embolism is suspected.
Baseline chest radiograph is completely normal. Which imaging study is most appropriate?
(A) Contrast-enhanced computed tomography pulmonary angiography (CTPA)
(B) Fluoroscopic barium swallow examination
(C) Radionuclide ventilation-perfusion (V/Q) scan [CORRECT ANSWER]
(D) Transthoracic echocardiogram with bubble study
Correct Answer: Option C — Radionuclide ventilation-perfusion (V/Q) scan
Rationale: CTPA requires iodinated intravenous contrast, which poses a severe risk of contrast-induced acute kidney injury in
patients with eGFR < 30 mL/min. When baseline chest radiographs are normal, a radionuclide V/Q scan is the preferred
non-nephrotoxic alternative for diagnosing pulmonary embolism. Option A is incorrect because cTPA poses significant risk of
nephrotoxicity in advanced chronic kidney disease (eGFR 18). Option B is incorrect because barium swallow evaluates esophageal
motility and structure, not pulmonary vascular occlusion. Option D is incorrect because echocardiogram evaluates intracardiac
shunts and right strain, but cannot definitively diagnose PE compared to V/Q scan.
NSG 550 ADVANCED HEALTH ASSESSMENT & DIAGNOSTIC REASONING Page 4 of 36
