The CMSRN (Certified Medical-Surgical Registered Nurse) is a nursing certification awarded by MSNCB.
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Twenty CMSRN (Certified Medical-Surgical Registered Nurse) questions, with the answers hidden until you want them — covering Management, Pathology, Procedures, Diagnostics and more. They are real cards from our 1050-card deck, not the 30 on the free preview page, so you can use both. Work through them cold, then use your score below to decide what to study next. MSNCB publishes the official exam outline — check it for the real blueprint.
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A 58-year-old patient is admitted with acute diverticulitis, LLQ pain, and fever. The provider orders ""Diet as tolerated."" As the RN, which dietary progression do you expect to implement during the initial acute phase?
Show answer →During acute inflammatory phases, the bowel needs ""rest."" Standard practice is NPO or clear liquids for 2-3 days, then progressing to a low-fiber/low-residue diet until inflammation and pain resolve. High-fiber is contraindicated during the acute flare-up as it increases peristalsis and pressure. Exam Tip: MSNCB often tests the transition from low-fiber (acute) to high-fiber (maintenance). Avoid high fiber until the patient is asymptomatic and the flare has fully subsided.
A patient hospitalized for diverticulitis suddenly develops a rigid, board-like abdomen and tachycardia. What is the priority nursing action and the most likely complication?
Show answer →This indicates peritonitis, likely due to a perforated diverticulum (Hinchey Stage III or IV). Priority: Notify the surgical team immediately, keep NPO, start IV fluids, and prepare for emergency surgery (e.g., Hartmann's procedure). Exam Tip: ""Rigid, board-like abdomen"" is a classic buzzword for perforation/peritonitis. Distractors often include bowel obstruction or abscess, but rigidity points to diffuse peritonitis rather than localized inflammation.
A patient with a history of diverticulosis asks how to prevent future episodes of diverticulitis. Based on current 2026 evidence-based guidelines, what dietary and lifestyle modifications should the nurse emphasize?
Show answer →Maintenance focuses on a high-fiber diet (25–35g/day) and adequate fluid intake (2L/day) to soften stools and reduce intraluminal pressure. Lifestyle: Regular physical activity and weight loss (obesity is a risk factor). Note: Current guidelines no longer restrict nuts, seeds, or popcorn, as evidence shows no correlation with flares. Exam Tip: Look for ""high fiber + high fluids"" as the gold standard for prevention. Do not choose options that restrict seeds unless the patient specifically identifies them as a personal trigger.
A 46-year-old patient with no family history of colorectal cancer (CRC) asks when they should have started screening. Based on current 2026 guidelines, what is the recommended age to begin average-risk screening and what is the ""gold standard"" test?
Show answer →Screening for average-risk adults begins at age 45. Colonoscopy every 10 years is the ""gold standard"" as it allows for both detection and removal of precancerous polyps. Other options include FIT annually or sDNA-FIT (Cologuard) every 3 years. MSNCB Focus: Recognize 45 as the current starting age (lowered from 50 in 2021/2022 updates) and the importance of screening adherence in the 45-49 age bracket. Distractors often include age 50 or 35.
A nurse is assessing a new colostomy 6 hours post-operatively. The stoma is dark red, moist, and slightly edematous. A small amount of serosanguinous drainage is noted. What is the correct nursing interpretation and action?
Show answer →This is a normal finding. A healthy stoma should be rose-to-brick red and moist. Edema is expected in the first 48-72 hours. Nursing Action: Document and continue to monitor. INTERVENE if the stoma is pale (anemia), dusky/purple/black (ischemia/necrosis), or dry. MSNCB Exam Tip: Ischemia is a surgical emergency; normal stomas may bleed slightly when touched but should not have heavy/active hemorrhage.
A patient with cirrhosis and ascites presents with new-onset confusion, low-grade fever, and diffuse abdominal pain. Paracentesis is performed. Which laboratory finding in the ascitic fluid is the ""gold standard"" for diagnosing Spontaneous Bacterial Peritonitis (SBP)?
Show answer →An absolute neutrophil count (ANC) ≥ 250 cells/mm³ in the ascitic fluid. Calculation: (WBC count × % neutrophils). Treatment should begin immediately with an intravenous third-generation cephalosporin (e.g., Cefotaxime) without waiting for culture results. Clinical Pearl: SBP often presents subtly without classic ""acute abdomen"" signs. Exam Strategy: Distinguish SBP from secondary peritonitis (which has multiple organisms and lower glucose).
A patient with cirrhosis is found to have medium-sized esophageal varices on screening endoscopy. What is the primary goal of initiating a non-selective beta-blocker (NSBB) like Propranolol or Nadolol in this patient?
Show answer →Primary prophylaxis to prevent the first variceal bleed. NSBBs reduce portal pressure by: 1) Decreasing cardiac output (Beta-1 blockade) and 2) Causing splanchnic vasoconstriction (Beta-2 blockade), leaving alpha-adrenergic activity unopposed. Exam Tip: Titrate to a heart rate of 55–60 bpm. Monitor for hypotension. Note: Carvedilol is increasingly used for its alpha-1 blocking properties, which further lower portal resistance.
When teaching a patient with cirrhosis about nutritional management of ascites, which dietary restriction is the most critical for preventing fluid accumulation?
Show answer →Sodium restriction (typically <2,000 mg per day). Rationale: Sodium retention is the primary driver of fluid accumulation in cirrhosis due to RAAS activation. Clinical Pearl: Avoid ""no-salt"" substitutes containing potassium if the patient is on Spironolactone. Fluid restriction is usually only necessary if serum sodium drops below 120–125 mEq/L. Exam Tip: Focus on sodium as the primary culprit, not necessarily fluid restriction unless hyponatremia is severe.
A patient returns to the clinic 1 month post-cholecystectomy complaining of persistent RUQ pain, flatulence, and nausea similar to their pre-operative symptoms. What condition should the nurse discuss with the provider?
Show answer →Condition: Post-cholecystectomy Syndrome (PCS). Rationale: Occurs in 10-15% of patients due to residual stones, biliary dyskinesia, or a remnant cystic duct. Strategy: MSNCB tests the recognition that surgery doesn't always resolve biliary-type pain; further workup (ERCP/MRCP) or pharmacological management (antispasmodics) may be required.
A patient's colonoscopy reveals areas of inflamed tissue separated by healthy segments (""skip lesions"") throughout the ascending colon and terminal ileum. Which condition does this pathology most likely indicate?
Show answer →Crohn's Disease (CD). Unlike Ulcerative Colitis (UC), which involves continuous inflammation starting at the rectum and moving proximally, CD is characterized by ""skip lesions"" where diseased areas are interspersed with normal tissue. CD can affect any part of the GI tract from mouth to anus, whereas UC is limited to the colon and rectum. MSNCB Exam Tip: Look for ""terminal ileum"" or ""patchy"" to point toward CD.
A patient's intestinal biopsy shows inflammation extending through all layers of the bowel wall (transmural). Which Inflammatory Bowel Disease (IBD) subtype and associated complication is most likely?
Show answer →Crohn's Disease (CD) with a high risk for fistula formation. Transmural inflammation (involving the mucosa, submucosa, and serosa) is a hallmark of CD. This deep penetration often leads to the formation of fistulas (abnormal tracts between the bowel and other organs), abscesses, and strictures. In contrast, UC inflammation is typically limited to the mucosa and submucosa. Exam Strategy: Transmural = Crohn's; Mucosal = UC.
A patient presents with 15-20 episodes of bloody diarrhea per day, severe tenesmus, and urgency. Colonoscopy shows uniform, continuous inflammation starting in the rectum. What is the most likely diagnosis?
Show answer →Ulcerative Colitis (UC). UC primarily affects the mucosal layer and is characterized by continuous involvement. Because it almost always involves the rectum (proctitis) and moves proximally, bloody stools, fecal urgency, and tenesmus (painful straining) are classic symptoms. Crohn's disease stools are more often fatty (steatorrhea) or non-bloody unless the colon is heavily involved.
A patient with an acute exacerbation of Ulcerative Colitis develops a fever, tachycardia, and a massively distended abdomen with decreased bowel sounds. What life-threatening pathological complication is suspected?
Show answer →Toxic Megacolon. This is an acute, life-threatening form of colonic distention (usually >6 cm) seen primarily in UC. The inflammatory process reaches the muscularis propria, paralyzing the colonic smooth muscle and leading to dilation and potential perforation. MSNCB Exam Tip: Avoid opioids and anticholinergics in these patients as they can decrease motility and precipitate this condition.
A patient with Crohn’s disease is admitted with a high-output enterocutaneous fistula. Why does Crohn’s disease pose a significantly higher risk for fistula formation compared to Ulcerative Colitis?
Show answer →The transmural nature of Crohn's Disease. Because inflammation penetrates the entire thickness of the bowel wall, it can create a pathway (fistula) to another loop of bowel (enteroenteric), the bladder (enterovesical), the skin (enterocutaneous), or the vagina. UC does not typically cause fistulas because the inflammatory process is superficial, affecting only the inner lining (mucosa/submucosa).
A biopsy report for a patient with suspected IBD mentions the presence of non-caseating granulomas. How does this finding influence the diagnosis and what is the pathological significance?
Show answer →It confirms Crohn's Disease (CD). Non-caseating granulomas (clusters of macrophages) are a pathognomonic histological feature of CD and are absent in Ulcerative Colitis. While they only appear in 40-60% of cases, their presence is a definitive differentiator. MSNCB focus: Granulomas = CD; Crypt abscesses = UC (though crypt abscesses can occasionally be seen in both, they are classic for UC).
A patient with a new ileostomy has 1,800 mL of output in the first 24 hours. What is the nurse's priority assessment and why?
Show answer →Assess for fluid volume deficit and electrolyte imbalances (specifically Na+ and K+). High-output (>1,500 mL/day) is common in the early post-op phase of ileostomies but places the patient at high risk for dehydration and metabolic acidosis. Clinical Pearl: Output typically ""thickens"" and decreases to 500-800 mL/day as the small bowel adapts over several weeks.
A nurse notes a PEG tube has become difficult to rotate and the internal bumper appears to be migrating into the gastric wall. What complication is suspected?
Show answer →Buried Bumper Syndrome. This occurs when the internal bolster migrates into the gastric mucosa, often due to excessive tension on the external bolster. It can lead to pain, bleeding, or perforation. Management: Notify the provider; may require endoscopic intervention. Prevention: Ensure 1-2 cm of ""play"" between the skin and external bolster and rotate the tube daily once the tract is mature.
A patient on 50% FiO2 has a PaO2 of 90 mmHg. Calculate the P/F ratio and determine the severity of lung injury based on the Berlin ARDS criteria.
Show answer →P/F Ratio = PaO2 / FiO2 (expressed as a decimal). Calculation: 90 / 0.50 = 180. According to Berlin criteria: Mild ARDS (P/F 200-300), Moderate ARDS (P/F 100-200), and Severe ARDS (P/F < 100). This patient is in the Moderate ARDS range. Rational: Lower ratios indicate worsening shunting and gas exchange impairment. Exam Tip: MSNCB often tests the ability to convert FiO2 percentages (e.g., 50%) to decimals (0.50) for this specific calculation.
An intubated patient has an ulcer on the inner lip caused by an endotracheal tube. How should the med-surg nurse document the stage of this injury?
Show answer →Mucosal Membrane Pressure Injury (Unstaged). These are found on mucous membranes (e.g., mouth, nares, urethra) with a history of a medical device at the site. Due to the anatomy of the tissue, these injuries CANNOT be staged using the standard NPIAP 1-4 system. Exam Tip: Only stage injuries on cutaneous (skin) surfaces. Non-staged does not mean ""unstageable"" due to slough.
A patient is prescribed Neomycin for acute Hepatic Encephalopathy. Which assessment finding requires the nurse to immediately notify the provider and question the continued use of this drug?
Show answer →Increased Serum Creatinine or decreased urine output. Neomycin is an aminoglycoside; while technically ""non-absorbable,"" enough can be absorbed systemically in patients with impaired mucosal integrity to cause nephrotoxicity and ototoxicity. **Clinical Reasoning:** Because of these risks, Rifaximin has largely replaced Neomycin in modern practice. On the CMSRN, recognize Neomycin as a second-line agent and monitor renal function (BUN/Creatinine) and hearing.
17–20 correct
Strong. Move to the hardest material and timed drilling rather than re-reading topics you already know.
12–16 correct
A normal mid-prep score. Work the topics you missed one at a time — the topic pages below are built for exactly that.
Under 12 correct
Early days. Go topic by topic instead of taking more mixed tests: pick your weakest area below and drill it until the questions feel routine.
Management questions
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Pathology questions
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Diagnostics questions
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Pharmacology questions
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