10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The COCN-AP exam has 120 questions and runs 2 hours.
These 10 free COCN-AP questions are organized by exam domain, so you can see how each part of the Certified Ostomy Care Nurse - Advanced Practice (COCN-AP) blueprint is tested. Reveal the answer and explanation under each question.
Urine culture is ordered for a patient with an ileal conduit who has new fever and flank discomfort but is hemodynamically stable. The current pouch has been worn overnight, and a clinician trained in conduit catheterization is not immediately available. How should a suitable specimen be obtained without an unnecessary delay?
Correct answer: B - Cleanse the stoma and collect freshly dripping urine in a sterile container.
A 3.2-kg infant recovering from surgery for necrotizing enterocolitis has 96 mL of ileostomy effluent and 24 mL of nasogastric drainage recorded separately over 24 hours. Perfusion is currently satisfactory. The unit follows the Royal Children's Hospital fecal-stoma pathway, which requires reporting stoma losses of at least 20 mL/kg/day. Which interpretation correctly applies that reporting rule?
Correct answer: D - 30 mL/kg/day; report the stoma loss for fluid-replacement assessment.
A small peristomal ulcer in a patient with Crohn disease has enlarged rapidly despite correction of pouch leakage. It is exquisitely painful, has an undermined violaceous edge, and extended beyond its previous margins after local debridement. A superficial swab grew mixed skin organisms, but there is no spreading cellulitis or drainable collection. Which diagnosis best explains the course of this lesion?
Correct answer: A - Peristomal pyoderma gangrenosum
Bleeding and urgency persist in a patient with a stapled ileal pouch-anal anastomosis despite empiric treatment for pouchitis. Pouchoscopy shows a normal pouch body and prepouch ileum. Erythema, friability, and biopsy-confirmed active inflammation are confined to the retained rectal cuff. This distribution supports a diagnosis of:
Correct answer: C - Cuffitis
During a supply review, a 79-year-old who lives alone explains, 'I want to keep changing the pouch myself.' Cognition is intact, but progressive hand arthritis prevents cutting an opening and fastening the current two-piece coupling. The patient can remove a barrier, position it over the stoma, and operate a drainable pouch closure. Stoma measurements have been stable for three months. The supplier stocks a pre-cut one-piece system covered by the patient's insurance. The most appropriate plan is to:
Correct answer: D - Trial the covered pre-cut one-piece system and observe the patient completing a change.
An adult with short bowel and an end ileostomy has been rehydrated intravenously; orthostatic symptoms have resolved and creatinine has returned to baseline. Output remains 2.3 L/day. At home, the patient had responded to thirst by drinking 3 L of plain water daily. Obstruction and infection have been excluded. For the oral phase of treatment, which change is most likely to improve net fluid absorption?
Correct answer: C - Replace much of the plain water with prescribed glucose-saline solution containing at least 90 mmol/L sodium.
On postoperative day 2, a newly created end colostomy develops progressive dark discoloration. Endoscopic assessment by the surgical team confirms nonviable bowel extending below the abdominal fascial level. Blood pressure remains normal. The advanced practice nurse should now coordinate:
Correct answer: A - Emergency operative revision with resection of the nonviable bowel.
'I do all my personal care sitting in this chair,' a patient explains during preoperative ileostomy marking. The usual lower-abdominal site disappears beneath a skin fold when the patient sits. An upper-abdominal area within the rectus remains flat, visible, and reachable; the surgeon considers either location feasible. Which marking decision best supports independent postoperative care?
Correct answer: A - Mark the accessible upper rectus site after checking the pouching surface in the patient's usual positions.
Two assessments using the original Ostomy Skin Tool cover the same adhesive footprint. Before a pouching-system change, the subscores were discoloration 5, erosion 2, and tissue overgrowth 0. Two weeks later they are discoloration 4, erosion 3, and tissue overgrowth 0. The total remains 7, while wear time has increased from one to three days. What should drive the evaluation of this trial?
Correct answer: B - Reassess the erosion despite the unchanged total and longer wear time.
A randomized trial compares structured nurse follow-up with usual care after ileostomy discharge. For 30-day dehydration readmission, the reported risk ratio is 0.72, with a 95% confidence interval of 0.46 to 1.12. In an evidence brief for the ostomy service, which conclusion is justified?
Correct answer: C - The result is compatible with benefit, no effect, or increased readmissions.
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