Synopsis
Interpret an abdominal radiograph in a reproducible sequence, recognise important bowel, soft-tissue, calcific, skeletal and device findings, and state when the examination cannot answer the urgent clinical question.
- Start with patient identity, date, indication, projection, exposure, rotation, motion and anatomical coverage.
- Use one search pattern: bowel gas, organ and psoas outlines, calcification, bones and lung bases, then lines, tubes and foreign bodies.
- Describe bowel calibre and distribution without diagnosing obstruction from diameter alone; seek a transition and complications on CT when clinically important.
Key red flags
Free intraperitoneal gas, portal venous gas, pneumatosis or a markedly abnormal gas pattern with toxicity requires immediate escalation.
A normal or technically limited abdominal radiograph does not exclude obstruction, perforation, ischaemia, appendicitis or other serious disease.
Unexpected tube malposition, retained foreign body or a sharp object requires direct communication and an assigned action.
Pain out of proportion, rising lactate, shock or peritonism outweighs reassuring appearances and may require urgent contrast CT or surgery.
Subdiaphragmatic gas on an erect view, Rigler sign or other abnormal gas outlining may indicate pneumoperitoneum, but absence is not exclusionary.
Trace every enteric tube, stent, drain, catheter and surgical item along its entire visible course and compare the tip or side holes with the intended anatomy.
Reasoning priorities
Assess selected gas patterns, radiopaque material, calcification and device position rapidly.
Projectional overlap limits sensitivity and cause determination; a negative film cannot close a high-risk diagnostic pathway.
Worked reasoning
A stable adult has abdominal pain, vomiting and a newly obtained supine abdominal radiograph.
- Context: confirm the clinical question, surgical history, last stool or flatus, physiology and whether peritonism is present.
- Reasoning: verify adequacy, then review gas pattern, soft tissues, calcification, bones, lung bases and every device without stopping at the first abnormality.
- Outcome: describe the pattern and confidence, state whether obstruction or perforation remains possible, and recommend CT or another test only when it changes care.
- Verification: communicate urgent findings directly, document limitations and ensure the responsible team reviews both the report and the patient.