Synopsis
Select outpatient care only for physiologically stable uncomplicated diverticulitis with adequate oral intake, manageable pain, acceptable comorbidity and reliable review; admit sepsis, complication or inability to self-care.
- Home treatment requires uncomplicated anatomy, stable physiology, controlled pain, adequate oral intake and a dependable route back to care.
- For a systemically well person with uncomplicated disease, review the need for antibiotics and consider discharge without them.
- Systemic illness, immune suppression or significant comorbidity favours antibiotics even when CT shows no abscess or perforation.
Key red flags
Peritonism, systolic hypotension, altered mental state or oliguria excludes routine outpatient care and requires urgent resuscitation.
Inability to retain fluids or oral medicines creates dehydration and treatment failure even when the original CT was uncomplicated.
Immune suppression, substantial frailty, major comorbidity or unreliable access to urgent review lowers the threshold for admission and antibiotics.
Reasoning priorities
separate uncomplicated from complicated disease.
Abscess, free perforation, obstruction or fistula generally shifts care toward admission.
Worked reasoning
A 52-year-old has CT-confirmed uncomplicated sigmoid diverticulitis, temperature 37.1°C, pulse 78/min, blood pressure 128/74 mmHg, eGFR 88 mL/min/1.73 m² and pain controlled by oral analgesia. Fluids are tolerated and a partner can assist at home.
- Review CT explicitly for absence of abscess, free perforation, obstruction and fistula, and repeat the abdomen after analgesia to confirm there is no guarding.
- Check immune status, major comorbidity, cognition, mobility, oral intake, analgesic effect and the practical route for same-day reattendance.
- Because the patient is systemically well with uncomplicated disease, agree no antibiotic treatment and provide written hydration, diet and analgesia instructions.
- Book a telephone or face-to-face review in 48 hours and give immediate return triggers: fever, increasing constant pain, vomiting, distension, syncope or reduced urine.
- At review, temperature remains normal, pain has fallen from 6/10 to 2/10 and normal meals are tolerated; document recovery and investigate if the course later becomes atypical.