How Rome IV defines functional constipation
The Rome IV criteria for functional constipation require two or more of the following: straining, lumpy or hard stools, a sensation of incomplete evacuation, a sensation of anorectal blockage, or manual maneuvers to aid defecation, each occurring in more than 25% of defecations, or fewer than 3 spontaneous bowel movements per week. The criteria must be fulfilled for the last 3 months, with symptom onset at least 6 months before diagnosis. Straining counts only when it occurs in more than one-quarter of defecations, which is exactly what the correct option states.
Why the percentage matters
Almost everyone strains occasionally. Rome IV uses a frequency threshold so that a symptom is counted only when it is a regular feature of the person's bowel pattern. That is why the criteria are written as "more than 25% of defecations" rather than "ever" or "once a week." The same threshold applies to hard stools, incomplete evacuation, anorectal blockage, and manual maneuvers. The frequency criterion is separate and uses a fixed number: fewer than 3 spontaneous bowel movements a week.
| Option | Rome IV wording | Counts? |
|---|
| Straining at least once a week | Straining in more than 25% of defecations | No |
| Hard stools began within the past month | Criteria met for 3 months, onset 6 months before | No |
| Straining in more than one-quarter of defecations | Matches the criterion | Yes |
| Fewer than 5 bowel movements a week | Fewer than 3 spontaneous bowel movements a week | No |
Applying the criteria to this client
This client takes oral morphine daily, so her constipation may be opioid-induced. Rome IV classifies opioid-induced constipation separately, and the nurse should report the opioid as a likely contributor. The question, however, asks only which finding counts toward the functional constipation criteria the facility uses, so the task is to recognize the correct wording. Watch out! Distractors change one detail: the frequency (once a week instead of more than 25%), the duration (1 month instead of 3 months with 6-month onset), or the number (5 instead of 3).
Exam takeaway
Memorize the structure: two or more symptoms, each in more than 25% of defecations, or fewer than 3 spontaneous bowel movements a week, present for 3 months with onset 6 months earlier. Key point! Rome IV criteria depend on precise thresholds; read every number in the option before choosing.