NR 511 Final Exam – Differential Diagnosis and Primary Care
200+ Practice Questions with Verified Answers and Rationales | Latest
2026-2027 | Graded A+
SECTION 1: GASTROINTESTINAL DISORDERS
Questions 1-40
Q1. A 22-year-old female presents with intermittent cramping abdominal pain
that is worse with eating, watery frequent stools, nausea, vomiting, and fatigue.
Her boyfriend is also sick, and they both traveled recently. Stool studies are
positive for leukocytes and Giardia. What are the most likely differential
diagnoses?
A) Irritable bowel syndrome and lactose intolerance
B) Giardiasis and viral gastroenteritis
C) Inflammatory bowel disease and celiac disease
D) Peptic ulcer disease and cholecystitis
Answer: B) Giardiasis and viral gastroenteritis
Rationale: The presentation of acute diarrhea with nausea, vomiting, and
abdominal cramping in a patient with recent travel and a sick contact suggests an
infectious etiology. The positive stool studies for leukocytes and Giardia point
toward giardiasis as the primary diagnosis, with viral gastroenteritis as a
differential. Giardia is a common parasitic cause of diarrhea in travelers. IBS (A) is
a chronic functional disorder that does not present acutely with positive stool
studies. IBD (C) is a chronic inflammatory condition. PUD (D) typically presents
with epigastric pain, not diarrhea .
Q2. A patient presents with recurrent abdominal pain, abnormal bowel
movements, and bloating for the past 6 months. The pain is relieved after bowel
movements. He has a history of depression and anxiety. What is the most likely
diagnosis?
,A) Inflammatory bowel disease
B) Celiac disease
C) Irritable bowel syndrome (IBS)
D) Diverticulitis
Answer: C) Irritable bowel syndrome (IBS)
Rationale: IBS is characterized by recurrent abdominal pain associated with
abnormal bowel movements (diarrhea, constipation, or mixed) for at least 6
months. Symptoms are related to changes in gut microbiota, autonomic
dysfunction, and altered GI motility. The presence of psychological factors
(depression, anxiety) is commonly associated with IBS. Pain relieved by defecation
is a key feature. IBD (A) involves inflammation and more serious sequelae. Celiac
disease (B) is triggered by gluten. Diverticulitis (D) presents with acute LLQ pain
and fever .
Q3. Which of the following is the most common cause of acute gastroenteritis in
adults?
A) Rotavirus
B) Norovirus
C) Salmonella
D) Escherichia coli
Answer: B) Norovirus
Rationale: Norovirus is the leading cause of acute gastroenteritis in adults.
Rotavirus (A) is the most common cause in children under 2 years old. Salmonella
(C) and E. coli (D) are bacterial causes that can cause gastroenteritis but are less
common overall than norovirus in adults .
Q4. Which of the following best describes the difference between Irritable
Bowel Syndrome (IBS) and Inflammatory Bowel Disease (IBD)?
A) IBS is an organic disease, while IBD is a functional disorder
B) IBS is a disorder of bowel function without anatomic abnormality; IBD is a
,chronic immunologic disease with intestinal inflammation
C) IBS is more serious than IBD
D) IBS and IBD are the same condition
Answer: B) IBS is a disorder of bowel function without anatomic abnormality;
IBD is a chronic immunologic disease with intestinal inflammation
Rationale: IBS is a functional gastrointestinal disorder characterized by abnormal
bowel function without identifiable anatomic or biochemical abnormalities. It is
not associated with serious medical consequences like IBD or cancer. IBD (which
includes Crohn's disease and ulcerative colitis) is a chronic immunologic disease
that manifests as intestinal inflammation and can lead to serious complications.
IBS does not cause inflammation, bleeding, or structural damage to the bowel .
Q5. A patient with ulcerative colitis would most likely present with which of the
following?
A) Skip lesions throughout the GI tract
B) Inflammation limited to the mucosal surface of the colon with friability and
bleeding
C) Deep transmural inflammation
D) Perianal involvement and fistulas
Answer: B) Inflammation limited to the mucosal surface of the colon with
friability and bleeding
Rationale: Ulcerative colitis (UC) is characterized by inflammation limited to the
mucosal surface of the colon, resulting in friability, erosions, and bleeding. It most
commonly affects the rectosigmoid area but can involve the entire colon.
Symptoms include bloody diarrhea with mucus, cramping, and urgency. Skip
lesions (A), transmural inflammation (C), and perianal involvement with fistulas
(D) are characteristic of Crohn's disease, not UC .
Q6. Crohn's disease is characterized by which of the following?
, A) Inflammation limited to the mucosal surface of the colon
B) Segmental involvement with "skip lesions" and transmural inflammation
C) Always limited to the rectum
D) Inflammation limited to the small intestine only
Answer: B) Segmental involvement with "skip lesions" and transmural
inflammation
Rationale: Crohn's disease is characterized by segmental involvement of the GI
tract with "skip lesions" (areas of diseased bowel separated by normal mucosa).
The inflammation extends transmurally (through all layers of the bowel wall) and
can affect any portion of the GI tract from the mouth to the anus. Complications
include fibrosis, strictures, fistulas, and ulcerations. Perianal involvement is
common in Crohn's disease .
Q7. A patient presents with left lower quadrant pain, tenderness, fever, nausea,
and vomiting. What is the most likely diagnosis?
A) Acute appendicitis
B) Diverticulitis
C) Crohn's disease
D) Ulcerative colitis
Answer: B) Diverticulitis
Rationale: Diverticulitis typically presents with left lower quadrant (LLQ) pain and
tenderness, fever, nausea, and vomiting. This contrasts with appendicitis, which
typically presents with right lower quadrant pain. Crohn's disease (C) can also
cause LLQ pain but is a chronic condition. Ulcerative colitis (D) typically presents
with bloody diarrhea and cramping .
Q8. Which diagnostic test is preferred for diagnosing diverticulitis, especially if
perforation or peritonitis is suspected?
A) Plain abdominal X-ray
B) CT with contrast
200+ Practice Questions with Verified Answers and Rationales | Latest
2026-2027 | Graded A+
SECTION 1: GASTROINTESTINAL DISORDERS
Questions 1-40
Q1. A 22-year-old female presents with intermittent cramping abdominal pain
that is worse with eating, watery frequent stools, nausea, vomiting, and fatigue.
Her boyfriend is also sick, and they both traveled recently. Stool studies are
positive for leukocytes and Giardia. What are the most likely differential
diagnoses?
A) Irritable bowel syndrome and lactose intolerance
B) Giardiasis and viral gastroenteritis
C) Inflammatory bowel disease and celiac disease
D) Peptic ulcer disease and cholecystitis
Answer: B) Giardiasis and viral gastroenteritis
Rationale: The presentation of acute diarrhea with nausea, vomiting, and
abdominal cramping in a patient with recent travel and a sick contact suggests an
infectious etiology. The positive stool studies for leukocytes and Giardia point
toward giardiasis as the primary diagnosis, with viral gastroenteritis as a
differential. Giardia is a common parasitic cause of diarrhea in travelers. IBS (A) is
a chronic functional disorder that does not present acutely with positive stool
studies. IBD (C) is a chronic inflammatory condition. PUD (D) typically presents
with epigastric pain, not diarrhea .
Q2. A patient presents with recurrent abdominal pain, abnormal bowel
movements, and bloating for the past 6 months. The pain is relieved after bowel
movements. He has a history of depression and anxiety. What is the most likely
diagnosis?
,A) Inflammatory bowel disease
B) Celiac disease
C) Irritable bowel syndrome (IBS)
D) Diverticulitis
Answer: C) Irritable bowel syndrome (IBS)
Rationale: IBS is characterized by recurrent abdominal pain associated with
abnormal bowel movements (diarrhea, constipation, or mixed) for at least 6
months. Symptoms are related to changes in gut microbiota, autonomic
dysfunction, and altered GI motility. The presence of psychological factors
(depression, anxiety) is commonly associated with IBS. Pain relieved by defecation
is a key feature. IBD (A) involves inflammation and more serious sequelae. Celiac
disease (B) is triggered by gluten. Diverticulitis (D) presents with acute LLQ pain
and fever .
Q3. Which of the following is the most common cause of acute gastroenteritis in
adults?
A) Rotavirus
B) Norovirus
C) Salmonella
D) Escherichia coli
Answer: B) Norovirus
Rationale: Norovirus is the leading cause of acute gastroenteritis in adults.
Rotavirus (A) is the most common cause in children under 2 years old. Salmonella
(C) and E. coli (D) are bacterial causes that can cause gastroenteritis but are less
common overall than norovirus in adults .
Q4. Which of the following best describes the difference between Irritable
Bowel Syndrome (IBS) and Inflammatory Bowel Disease (IBD)?
A) IBS is an organic disease, while IBD is a functional disorder
B) IBS is a disorder of bowel function without anatomic abnormality; IBD is a
,chronic immunologic disease with intestinal inflammation
C) IBS is more serious than IBD
D) IBS and IBD are the same condition
Answer: B) IBS is a disorder of bowel function without anatomic abnormality;
IBD is a chronic immunologic disease with intestinal inflammation
Rationale: IBS is a functional gastrointestinal disorder characterized by abnormal
bowel function without identifiable anatomic or biochemical abnormalities. It is
not associated with serious medical consequences like IBD or cancer. IBD (which
includes Crohn's disease and ulcerative colitis) is a chronic immunologic disease
that manifests as intestinal inflammation and can lead to serious complications.
IBS does not cause inflammation, bleeding, or structural damage to the bowel .
Q5. A patient with ulcerative colitis would most likely present with which of the
following?
A) Skip lesions throughout the GI tract
B) Inflammation limited to the mucosal surface of the colon with friability and
bleeding
C) Deep transmural inflammation
D) Perianal involvement and fistulas
Answer: B) Inflammation limited to the mucosal surface of the colon with
friability and bleeding
Rationale: Ulcerative colitis (UC) is characterized by inflammation limited to the
mucosal surface of the colon, resulting in friability, erosions, and bleeding. It most
commonly affects the rectosigmoid area but can involve the entire colon.
Symptoms include bloody diarrhea with mucus, cramping, and urgency. Skip
lesions (A), transmural inflammation (C), and perianal involvement with fistulas
(D) are characteristic of Crohn's disease, not UC .
Q6. Crohn's disease is characterized by which of the following?
, A) Inflammation limited to the mucosal surface of the colon
B) Segmental involvement with "skip lesions" and transmural inflammation
C) Always limited to the rectum
D) Inflammation limited to the small intestine only
Answer: B) Segmental involvement with "skip lesions" and transmural
inflammation
Rationale: Crohn's disease is characterized by segmental involvement of the GI
tract with "skip lesions" (areas of diseased bowel separated by normal mucosa).
The inflammation extends transmurally (through all layers of the bowel wall) and
can affect any portion of the GI tract from the mouth to the anus. Complications
include fibrosis, strictures, fistulas, and ulcerations. Perianal involvement is
common in Crohn's disease .
Q7. A patient presents with left lower quadrant pain, tenderness, fever, nausea,
and vomiting. What is the most likely diagnosis?
A) Acute appendicitis
B) Diverticulitis
C) Crohn's disease
D) Ulcerative colitis
Answer: B) Diverticulitis
Rationale: Diverticulitis typically presents with left lower quadrant (LLQ) pain and
tenderness, fever, nausea, and vomiting. This contrasts with appendicitis, which
typically presents with right lower quadrant pain. Crohn's disease (C) can also
cause LLQ pain but is a chronic condition. Ulcerative colitis (D) typically presents
with bloody diarrhea and cramping .
Q8. Which diagnostic test is preferred for diagnosing diverticulitis, especially if
perforation or peritonitis is suspected?
A) Plain abdominal X-ray
B) CT with contrast
