IBD (Inflammatory Bowel Disease) Clinical Knowledge Assessment — Questions and Answers

Question 1: C-reactive protein (CRP) is a more reliable marker of disease activity in which IBD type compared to the other?

Crohn's disease, particularly with ileal involvement (Correct answer)
Indeterminate colitis only
Microscopic colitis
Ulcerative colitis only

Correct answer: Crohn's disease, particularly with ileal involvement

CRP reliably reflects systemic inflammation in Crohn's disease, especially transmural ileal disease, whereas UC patients frequently have near-normal CRP levels even with active mucosal inflammation confined to the colon.

Question 2: Pyoderma gangrenosum (PG) in IBD differs from erythema nodosum because PG characteristically:

Only occurs on the anterior shins
May occur independently of IBD activity and requires specific wound care plus immunosuppression (Correct answer)
Heals without scarring after treating the underlying IBD
Correlates directly with IBD disease activity

Correct answer: May occur independently of IBD activity and requires specific wound care plus immunosuppression

Unlike erythema nodosum, PG often does not mirror IBD activity, requires specific wound care (wet dressings, avoid aggressive debridement), and needs immunosuppressive therapy.

Question 3: Which skin manifestation of IBD is pathognomonic for Crohn's disease when it occurs at a non-perianal site?

Sweet's syndrome
Vitiligo
Metastatic Crohn's disease (skin granulomas distant from GI tract) (Correct answer)
Psoriasis

Correct answer: Metastatic Crohn's disease (skin granulomas distant from GI tract)

Metastatic Crohn's disease refers to non-caseating granulomas found in skin distant from the GI tract (e.g., limbs, trunk), and is specific to Crohn's disease.

Question 4: On CT scan, which finding is most specific for an IBD-related entero-enteric or entero-vesical fistula in Crohn's disease?

Mesenteric fat stranding
Lymphadenopathy
Wall thickening of a single bowel loop
Air in the bladder (pneumaturia) without instrumentation (Correct answer)

Correct answer: Air in the bladder (pneumaturia) without instrumentation

Pneumaturia (air in the bladder) without recent catheterization or instrumentation on CT is pathognomonic for an entero-vesical fistula, a complication of Crohn's disease.

Question 5: A patient with UC on azathioprine develops a WBC of 2.1 × 10³/μL. What is the most appropriate immediate management?

Immediately discontinue azathioprine and consult hematology (Correct answer)
Switch to 6-mercaptopurine at equivalent dose
Continue azathioprine and recheck CBC in 1 month
Reduce dose and add G-CSF growth factor

Correct answer: Immediately discontinue azathioprine and consult hematology

A WBC <3 × 10³/μL represents significant leukopenia, a serious azathioprine toxicity requiring immediate drug discontinuation and hematology consultation to prevent life-threatening opportunistic infections.

Question 6: Ustekinumab (Stelara) targets which cytokine pathway in treating Crohn's disease?

TNF-α and lymphotoxin
IL-12 and IL-23 via the p40 subunit (Correct answer)
IL-4 and IL-13
IFN-γ directly

Correct answer: IL-12 and IL-23 via the p40 subunit

Ustekinumab is a fully human monoclonal antibody targeting the shared p40 subunit of IL-12 and IL-23, blocking Th1 and Th17 immune responses.

Question 7: The Truelove and Witts criteria classify disease severity based on stool frequency, rectal bleeding, temperature, pulse, hemoglobin, and ESR in which condition?

Ulcerative colitis (Correct answer)
Microscopic colitis
Indeterminate colitis
Crohn's disease

Correct answer: Ulcerative colitis

Truelove and Witts criteria classify ulcerative colitis severity as mild, moderate, or severe using clinical and laboratory parameters including stool frequency, rectal bleeding, pulse, temperature, hemoglobin, and ESR.

Question 8: A client with IBD asks about the risk of colorectal cancer. The nurse correctly explains that colonoscopy surveillance should begin:

Immediately at diagnosis
After 8–10 years of extensive colitis (Correct answer)
Only if family history of colon cancer exists
At age 50 like the general population

Correct answer: After 8–10 years of extensive colitis

Clients with extensive ulcerative colitis or Crohn's colitis have increased cancer risk and should begin surveillance colonoscopy after 8–10 years of disease.

Question 9: Parenteral nutrition (PN) in IBD is used primarily for which indication?

Weight management in obese IBD patients
Pre-biologic optimization in all patients
Routine supplementation during mild flares
Severe malnutrition, high-output fistulas, or short bowel syndrome where enteral feeding is not tolerated (Correct answer)

Correct answer: Severe malnutrition, high-output fistulas, or short bowel syndrome where enteral feeding is not tolerated

PN is reserved for severe cases where the gut cannot be used — high-output fistulas, SBS-related enteral intolerance, or severe malnutrition requiring bowel rest.

Question 10: A client with Crohn's disease develops a fistula between the bowel and bladder. Which symptom should the nurse expect to assess?

Hematuria with clots
Proteinuria >3g/day
Oliguria with flank pain
Pneumaturia (air in urine) (Correct answer)

Correct answer: Pneumaturia (air in urine)

An enterovesical fistula allows bowel gas and bacteria to enter the bladder, causing pneumaturia and recurrent UTIs.

Question 11: Which micronutrient deficiency is most common in patients with Crohn's disease affecting the terminal ileum?

Niacin
Riboflavin
Vitamin B12 (cobalamin) (Correct answer)
Vitamin C

Correct answer: Vitamin B12 (cobalamin)

Terminal ileal Crohn's disease impairs intrinsic factor-mediated vitamin B12 absorption, requiring intramuscular or high-dose oral B12 supplementation.

Question 12: Which vitamin deficiency requires specific monitoring in patients with Crohn's disease affecting the terminal ileum or following ileal resection?

Vitamin B12 (cobalamin) (Correct answer)
Vitamin C
Vitamin A
Vitamin K

Correct answer: Vitamin B12 (cobalamin)

Vitamin B12 absorption occurs exclusively in the terminal ileum via intrinsic factor; Crohn's disease involving this segment or ileal resection impairs B12 uptake, necessitating regular monitoring and parenteral supplementation.

Question 13: Anemia in IBD is most commonly due to which combination of causes?

Hemolytic anemia and aplastic anemia
Vitamin K deficiency
Iron deficiency anemia (chronic blood loss, malabsorption) and anemia of chronic inflammation (Correct answer)
B12 deficiency and folate deficiency exclusively

Correct answer: Iron deficiency anemia (chronic blood loss, malabsorption) and anemia of chronic inflammation

IBD anemia most commonly results from iron deficiency (chronic GI blood loss, impaired duodenal absorption) combined with anemia of chronic inflammation (hepcidin-mediated iron sequestration).

Question 14: Which of the following best describes the mechanism of corticosteroid resistance in IBD?

Antibody formation against corticosteroids
Reduced intestinal absorption due to mucosal damage
Overexpression of MDR1 p-glycoprotein effluxing steroids from cells (Correct answer)
Increased drug metabolism by gut bacteria

Correct answer: Overexpression of MDR1 p-glycoprotein effluxing steroids from cells

Overexpression of MDR1 (multidrug resistance gene 1) encodes p-glycoprotein, which pumps glucocorticoids out of target cells, reducing their anti-inflammatory effect.

Question 15: Which radiological sign on plain abdominal X-ray suggests toxic megacolon as a complication of IBD?

Thumbprinting
Lead pipe sign
String sign of Kantor
Transverse colon diameter >6 cm with mucosal edema (Correct answer)

Correct answer: Transverse colon diameter >6 cm with mucosal edema

Toxic megacolon is diagnosed when the transverse colon dilates to >6 cm (or cecum >9 cm) with associated systemic toxicity and mucosal edema on X-ray.

Question 16: What is the recommended first-line treatment for mild-to-moderate left-sided ulcerative colitis?

Oral prednisolone
Azathioprine monotherapy
Infliximab infusion
Topical (rectal) mesalamine suppositories or enemas combined with oral mesalamine (Correct answer)

Correct answer: Topical (rectal) mesalamine suppositories or enemas combined with oral mesalamine

Combined topical and oral mesalamine is more effective than either alone and is the evidence-based first-line approach for left-sided UC.

Question 17: Colorectal cancer (CRC) risk in UC increases significantly with which additional comorbidity?

Concurrent Crohn's disease
Concurrent primary sclerosing cholangitis (PSC) (Correct answer)
Concurrent pyoderma gangrenosum
Concurrent ankylosing spondylitis

Correct answer: Concurrent primary sclerosing cholangitis (PSC)

UC patients with PSC have a dramatically increased CRC risk (>30-fold baseline) requiring annual colonoscopic surveillance starting from PSC diagnosis regardless of UC duration.

Question 18: In ulcerative colitis clinical trials, mucosal healing is most commonly defined as a Mayo endoscopic subscore of:

1 or 2
0 or 1 (Correct answer)
2 or less
0 only

Correct answer: 0 or 1

Mucosal healing in UC trials is typically defined as a Mayo endoscopic subscore of 0 (normal/inactive) or 1 (mild erythema with decreased vascular pattern), representing the threshold for acceptable endoscopic response.

Question 19: Vitamin D deficiency in IBD patients is clinically significant because vitamin D plays which role beyond bone health?

It prevents anemia of chronic disease
It directly inhibits TNF-α production
It has immunomodulatory effects, and deficiency is associated with increased IBD disease activity and flare risk (Correct answer)
It enhances mesalamine absorption

Correct answer: It has immunomodulatory effects, and deficiency is associated with increased IBD disease activity and flare risk

Vitamin D modulates innate and adaptive immunity, and deficiency is associated with increased IBD disease activity; supplementation may reduce relapse risk in deficient patients.

Question 20: Which IBD complication is characterized by the presence of air (pneumatosis) within the bowel wall and is a surgical emergency?

Internal fistula
Stricture formation
Toxic megacolon with impending perforation (Correct answer)
Intestinal obstruction from adhesions

Correct answer: Toxic megacolon with impending perforation

Toxic megacolon with pneumatosis coli (air in the bowel wall) signifies impending or actual perforation and is a surgical emergency requiring immediate colectomy.

Question 21: A patient with Crohn's disease develops a low-output enterocutaneous fistula after surgery. What is the initial management priority?

Immediate reoperation to close the fistula
Starting high-dose corticosteroids immediately
Initiating anti-TNF therapy within 24 hours
Optimization of nutrition, skin care, control of sepsis, and delineation of anatomy (Correct answer)

Correct answer: Optimization of nutrition, skin care, control of sepsis, and delineation of anatomy

The SNAP approach (Sepsis control, Nutrition, Anatomy definition, Procedure) guides initial fistula management before considering surgical or biologic intervention.

Question 22: The low FODMAP diet is most appropriately used in IBD to manage which condition?

Nutritional deficiencies from malabsorption
Corticosteroid-induced hyperglycemia
Active mucosal inflammation
Concurrent irritable bowel syndrome (IBS)-like symptoms in IBD remission (Correct answer)

Correct answer: Concurrent irritable bowel syndrome (IBS)-like symptoms in IBD remission

Low FODMAP reduces fermentable carbohydrates that cause IBS-like functional symptoms (bloating, gas, pain) in IBD patients who are in endoscopic remission but have persistent GI symptoms.

Question 23: What is the mechanism of action of mesalamine (5-ASA) in treating ulcerative colitis?

Suppressing T-cell activation via calcineurin inhibition
Blocking TNF-α receptor binding
Inhibiting JAK1/JAK3 kinases
Local anti-inflammatory effect via inhibition of arachidonic acid metabolites and NF-κB in colonic mucosa (Correct answer)

Correct answer: Local anti-inflammatory effect via inhibition of arachidonic acid metabolites and NF-κB in colonic mucosa

Mesalamine exerts topical anti-inflammatory effects in the colonic mucosa by inhibiting NF-κB, COX pathways, and arachidonic acid metabolites independently of systemic absorption.

Question 24: Osteoporosis in IBD patients is driven by which combination of risk factors?

Excess dietary calcium intake and vitamin D toxicity
Chronic corticosteroid use, malabsorption of calcium/vitamin D, and chronic inflammation (IL-6, TNF-α activating osteoclasts) (Correct answer)
Immobility alone
Thiopurine-induced bone marrow suppression

Correct answer: Chronic corticosteroid use, malabsorption of calcium/vitamin D, and chronic inflammation (IL-6, TNF-α activating osteoclasts)

IBD-related osteoporosis results from cumulative steroid exposure, malabsorption of calcium and vitamin D, and pro-inflammatory cytokines (TNF-α, IL-6, IL-1) driving osteoclast-mediated bone resorption.

Question 25: Fistula formation in Crohn's disease most commonly occurs between which two structures?

Terminal ileum and sigmoid colon (ileo-sigmoid) (Correct answer)
Colon and bladder (entero-vesical)
Rectum and vagina (recto-vaginal)
Small bowel and skin (enterocutaneous)

Correct answer: Terminal ileum and sigmoid colon (ileo-sigmoid)

Ileo-sigmoid fistulas are the most common internal fistula in Crohn's disease, occurring when the inflamed terminal ileum adheres to and penetrates the adjacent sigmoid colon.

Question 26: In the full Mayo Scoring system for ulcerative colitis, what is the maximum possible total score?

15
12 (Correct answer)
18
9

Correct answer: 12

The full Mayo Score comprises four subscores (stool frequency, rectal bleeding, endoscopy findings, and physician's global assessment), each ranging 0–3, yielding a maximum total score of 12.

Question 27: A nurse caring for a client with IBD notes the client is jaundiced with elevated alkaline phosphatase and a beaded biliary tree on MRCP. The nurse recognizes this as which IBD-associated hepatobiliary complication?

Cholelithiasis from ileal disease
Primary biliary cholangitis
Primary sclerosing cholangitis (PSC) (Correct answer)
Autoimmune hepatitis

Correct answer: Primary sclerosing cholangitis (PSC)

Primary sclerosing cholangitis (PSC) causes multifocal bile duct strictures producing a beaded appearance on MRCP and is strongly associated with ulcerative colitis.

Question 28: Combination therapy with infliximab and azathioprine is superior to monotherapy primarily because of which pharmacological interaction?

Azathioprine enhances TNF-α production
Azathioprine increases infliximab receptor binding
Azathioprine reduces infliximab immunogenicity by suppressing anti-drug antibody formation (Correct answer)
They have synergistic effects on JAK-STAT signaling

Correct answer: Azathioprine reduces infliximab immunogenicity by suppressing anti-drug antibody formation

Azathioprine reduces the formation of anti-infliximab antibodies (immunogenicity), maintaining higher trough levels and prolonging infliximab efficacy.

Question 29: The Crohn's Disease Activity Index (CDAI) defines clinical remission as a score below which value?

200
250
150 (Correct answer)
100

Correct answer: 150

A CDAI score below 150 is defined as clinical remission in Crohn's disease, while scores above 450 indicate very severe disease activity.

Question 30: Which colonoscopic finding most reliably distinguishes UC from Crohn's colitis?

Presence of ulcers
Presence of pseudopolyps
Involvement of the rectum with continuous proximal extension (UC) vs. rectal sparing with skip lesions (Crohn's) (Correct answer)
Mucosal erythema

Correct answer: Involvement of the rectum with continuous proximal extension (UC) vs. rectal sparing with skip lesions (Crohn's)

Rectal involvement with continuous proximal extension is characteristic of UC, while rectal sparing and discontinuous skip lesions favor Crohn's colitis.

IBD (Inflammatory Bowel Disease) Clinical Knowledge Assessment

Knowledge assessment covering Inflammatory Bowel Disease including Crohn's disease, ulcerative colitis, disease monitoring, complications, extraintestinal manifestations, and IBD nutrition and lifestyle management, aligned with ABIM Gastroenterology board exam IBD content domain.

100

Questions

120 min

Time Limit

70%

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